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Commitments and Contingencies - Additional Information (Detail) - Vehicle	Apr. 30, 2025	Feb. 29, 2024
Loss Contingencies [Line Items]
Number of vehicles recalled	13,508	261,257

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482645/405-30-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section S99
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-Subparagraph (SAB Topic 5.W.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479583/944-40-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483359/720-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482395/460-10-55-27

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

+ Details

Overview	9 Months Ended
Sep. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview	Note 1 – Overview Gentherm Incorporated, a Michigan corporation, and its consolidated subsidiaries (“Gentherm”, “we”, “us”, “our” or the “Company”) is a global leader of innovative thermal and precision flow management technologies. Our automotive products include Climate Control Seats (CCS®), Climate Control Interiors (CCI™), Lumbar and Massage Comfort Solutions, Valve Systems, and Climate and Comfort Electronics. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. Our medical products include patient temperature management systems that can be found in hospitals throughout the world. On October 1, 2026, Gentherm completed its previously announced combination of the Performance Technologies business (“Performance Technologies”) of Modine Manufacturing Co., a Wisconsin corporation (“Modine”), with Gentherm. Refer to Note 3 “Acquisitions” for details. Basis of Presentation and Significant Accounting Policies The unaudited consolidated condensed financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations. The information furnished in the consolidated condensed financial statements include all adjustments (consisting of only normal, recurring adjustments) considered necessary to present fairly the results of operations, financial position and cash flows of the Company. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The operating results for interim periods are not necessarily indicative of results that may be expected for other interim periods or for the full year. In preparing these financial statements, management was required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. These estimates and assumptions are based on our historical experience, the terms of existing contracts, our evaluation of trends in the industry, information provided by our customers and suppliers and information available from other third-party sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty and may change as new events occur and additional information is obtained. As a result, actual results may differ significantly from our estimates, and any such differences may be material to our financial statements. All amounts in these notes to the consolidated condensed financial statements are presented in thousands, except share and per share data. Principles of Consolidation The consolidated condensed financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. The Company evaluates its relationship with other entities for consolidation and to identify whether such entities are variable interest entities and to assess whether the Company is the primary beneficiary of such entities. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer. Revenue Recognition - payments to customers From time to time, the Company provides cash incentives to customers in exchange for new business awards. The Company evaluates the underlying economics of each amount of consideration payable to a customer to determine the proper accounting by understanding the reasons for the payment, the rights and obligations resulting from the payment, the nature of the promises in the contract, and other relevant facts and circumstances. When the Company concludes that the payment is incurred only if the new business is obtained and the Company expects to recover the amounts from the customer over the term of the new business arrangement, the Company recognizes these payments as an asset. The Company amortizes the asset as a reduction of revenue as products related to the payment are transferred to the customer, based on the total amount of products expected to be sold over the term of the arrangement (generally 5 to 10 years following start of production). The Company evaluates the amounts capitalized each reporting period for recoverability and recognizes a reduction of revenue for any amounts that are no longer expected to be recovered over the term of the business arrangement. Payments to customers that are not capitalized are recognized as a reduction to revenue at the time of the commitment to make such payments. As of September 30, 2026 and December 31, 2025, total capitalized payments to customers were $21,537 and $18,168, respectively. During the three and nine months ended September 30, 2026, the Company recognized $704 and $1,679 as reductions of revenue due to amortization and write-off of previously capitalized payments. During the three and nine months ended September 30, 2025, the Company recognized $202 and $1,246 as reductions of revenue due to amortization and write-off of previously capitalized payments. The Company had no other material contract assets or contract liabilities as of September 30, 2026. Loss on Sale of Land and Building, net In January 2025, we completed the sale of our former headquarters building in Northville, Michigan for cash proceeds of $3,740. As a result, the Company recognized a loss on sale of $2,311 during the nine months ended September 30, 2025.

Overview

9 Months Ended

Sep. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Overview

Note 1 – Overview

Gentherm Incorporated, a Michigan corporation, and its consolidated subsidiaries (“Gentherm”, “we”, “us”, “our” or the “Company”) is a global leader of innovative thermal and precision flow management technologies. Our automotive products include Climate Control Seats (CCS®), Climate Control Interiors (CCI™), Lumbar and Massage Comfort Solutions, Valve Systems, and Climate and Comfort Electronics. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. Our medical products include patient temperature management systems that can be found in hospitals throughout the world.

On October 1, 2026, Gentherm completed its previously announced combination of the Performance Technologies business (“Performance Technologies”) of Modine Manufacturing Co., a Wisconsin corporation (“Modine”), with Gentherm. Refer to Note 3 “Acquisitions” for details.

Basis of Presentation and Significant Accounting Policies

The unaudited consolidated condensed financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations. The information furnished in the consolidated condensed financial statements include all adjustments (consisting of only normal, recurring adjustments) considered necessary to present fairly the results of operations, financial position and cash flows of the Company. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The operating results for interim periods are not necessarily indicative of results that may be expected for other interim periods or for the full year.

In preparing these financial statements, management was required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. These estimates and assumptions are based on our historical experience, the terms of existing contracts, our evaluation of trends in the industry, information provided by our customers and suppliers and information available from other third-party sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty and may change as new events occur and additional information is obtained. As a result, actual results may differ significantly from our estimates, and any such differences may be material to our financial statements.

All amounts in these notes to the consolidated condensed financial statements are presented in thousands, except share and per share data.

Principles of Consolidation

The consolidated condensed financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. The Company evaluates its relationship with other entities for consolidation and to identify whether such entities are variable interest entities and to assess whether the Company is the primary beneficiary of such entities. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer.

Revenue Recognition - payments to customers

From time to time, the Company provides cash incentives to customers in exchange for new business awards. The Company evaluates the underlying economics of each amount of consideration payable to a customer to determine the proper accounting by understanding the reasons for the payment, the rights and obligations resulting from the payment, the nature of the promises in the contract, and other relevant facts and circumstances. When the Company concludes that the payment is incurred only if the new business is obtained and the Company expects to recover the amounts from the customer over the term of the new business arrangement, the Company recognizes these payments as an asset. The Company amortizes the asset as a reduction of revenue as products related to the payment are transferred to the customer, based on the total amount of products expected to be sold over the term of the arrangement (generally 5 to 10 years following start of production). The Company evaluates the amounts capitalized each

reporting period for recoverability and recognizes a reduction of revenue for any amounts that are no longer expected to be recovered over the term of the business arrangement. Payments to customers that are not capitalized are recognized as a reduction to revenue at the time of the commitment to make such payments.

As of September 30, 2026 and December 31, 2025, total capitalized payments to customers were $21,537 and $18,168, respectively.

During the three and nine months ended September 30, 2026, the Company recognized $704 and $1,679 as reductions of revenue due to amortization and write-off of previously capitalized payments. During the three and nine months ended September 30, 2025, the Company recognized $202 and $1,246 as reductions of revenue due to amortization and write-off of previously capitalized payments.

The Company had no other material contract assets or contract liabilities as of September 30, 2026.

Loss on Sale of Land and Building, net

In January 2025, we completed the sale of our former headquarters building in Northville, Michigan for cash proceeds of $3,740. As a result, the Company recognized a loss on sale of $2,311 during the nine months ended September 30, 2025.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2026
Trading Arrangements, by Individual
Title	directors or Section 16 officers
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Segment Reporting - Segment Reporting About Property and Equipment, Net by Geographic Areas (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Segment Reporting Information [Line Items]
Property and equipment, net	$ 263,561	$ 270,614
Mexico
Segment Reporting Information [Line Items]
Property and equipment, net	49,986	50,506
China
Segment Reporting Information [Line Items]
Property and equipment, net	44,344	47,414
Germany
Segment Reporting Information [Line Items]
Property and equipment, net	40,966	50,761
United States
Segment Reporting Information [Line Items]
Property and equipment, net	38,099	40,361
Vietnam
Segment Reporting Information [Line Items]
Property and equipment, net	30,732	19,110
North Macedonia
Segment Reporting Information [Line Items]
Property and equipment, net	27,057	29,375
Hungary
Segment Reporting Information [Line Items]
Property and equipment, net	8,831	8,617
Czech Republic
Segment Reporting Information [Line Items]
Property and equipment, net	8,409	10,513
Morocco
Segment Reporting Information [Line Items]
Property and equipment, net	5,228	4,436
Ukraine
Segment Reporting Information [Line Items]
Property and equipment, net	5,207	5,467
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 4,702	$ 4,054

Commitments and Contingencies - Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Loss Contingency [Abstract]
Balance at the beginning of the period	$ 7,805	$ 3,507
Warranty claims paid	(6,561)	(6,227)
Warranty expense for products shipped during the current period	7,004	8,345
Adjustments to warranty estimates from prior periods	7,838	2,121
Adjustments due to currency translation	(150)	161
Balance at the end of the period	$ 15,936	$ 7,907

Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Note 6 – Goodwill and Other Intangibles

Goodwill

Changes in the carrying amount of goodwill, by reportable segment, for the nine months ended September 30, 2026 were as follows:


	Automotive			Medical		Total
Balance as of December 31, 2025	$	81,031		$	27,887	$	108,918
Acquisition of IME		—			15,610		15,610
Currency translation		(2,550	)		280		(2,270	)
Balance as of September 30, 2026	$	78,481		$	43,777	$	122,258

The accumulated impairment losses of goodwill for Automotive and Medical were $0 and $19,509, respectively, as of September 30, 2026.

Other Intangible Assets

Other intangible assets and accumulated amortization balances as of September 30, 2026 and December 31, 2025 were as follows:


	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	130,196	$	(82,594	)	$	(6,185	)	$	41,417
Technology		50,501		(36,793	)		(27	)		13,681
Product development costs		19,095		(18,932	)		(71	)		92
Trade names		1,600		(21	)		—			1,579
Software development		1,007		(554	)		—			453
Indefinite-lived:
Trade names		7,166		—			(530	)		6,636
Balance as of September 30, 2026	$	209,565	$	(138,894	)	$	(6,813	)	$	63,858

	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	121,316	$	(81,785	)	$	(6,185	)	$	33,346
Technology		48,478		(36,238	)		(27	)		12,213
Product development costs		19,943		(19,774	)		(71	)		98
Software development		1,007		(403	)		—			604
Indefinite-lived:
Trade names		7,065		—			(530	)		6,535
Balance as of December 31, 2025	$	197,809	$	(138,200	)	$	(6,813	)	$	52,796

In connection with the acquisition of IME, the Company recorded Customer relationships of $11,000, Technology of $3,300 and Trade names of $1,600. These definite-lived assets are being amortized using the straight-line method over their estimated useful lives of approximately 15 years, 8 years and 19 years, respectively.

Restructuring (Tables)

9 Months Ended

Sep. 30, 2026

Restructuring and Related Activities [Abstract]

Summary of Restructuring Expenses, Net by Reportable Segment

The following table summarizes restructuring expenses, net for the three and nine months ended September 30, 2026 and 2025 by reporting segment:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Automotive	$	4,782	$	3,972	$	16,481	$	10,410
Medical		3		14		329		170
Corporate		53		—		683		28
Total	$	4,838	$	3,986	$	17,493	$	10,608

Summary of Restructuring Activity for All Restructuring Initiatives

The following table summarizes restructuring activity for all restructuring initiatives for the nine months ended September 30, 2026:


	Employee Separation Costs			Other Related Costs, Net			Total
Balance at December 31, 2025	$	6,928		$	—		$	6,928
Additions, charged to restructuring expenses, net		5,537			1,163			6,700
Cash payments		(991	)		(1,163	)		(2,154	)
Change in estimate		(9	)		—			(9	)
Currency translation		(117	)		—			(117	)
Balance at March 31, 2026	$	11,348		$	—		$	11,348
Additions, charged to restructuring expenses, net		4,339			1,642			5,981
Cash payments		(2,822	)		(1,642	)		(4,464	)
Change in estimate		(17	)		—			(17	)
Currency translation		(78	)		—			(78	)
Balance at June 30, 2026	$	12,770		$	—		$	12,770
Additions, charged to restructuring expenses, net		2,423			2,415			4,838
Cash payments		(3,836	)		(1,516	)		(5,352	)
Non-cash utilization		—			(646	)		(646	)
Currency translation		(39	)		(29	)		(68	)
Balance at September 30, 2026	$	11,318		$	224		$	11,542

(Loss) Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2026

Earnings Per Share [Abstract]

(Loss) Earnings per Share and Weighted Average Shares Outstanding Used in Calculating Basic and Diluted (Loss) Earnings per Share

The following table illustrates (loss) earnings per share and the weighted average shares outstanding used in calculating basic and diluted (loss) earnings per share:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2026			2025		2026		2025
Net (loss) income	$	(2,590	)	$	14,949	$	6,048	$	15,298

Basic weighted average shares of Common Stock outstanding		30,671,855			30,479,846		30,613,282		30,618,564
Dilutive effect of restricted stock, restricted stock units and performance stock units		—			268,043		464,240		183,129
Diluted weighted average shares of Common Stock outstanding		30,671,855			30,747,889		31,077,522		30,801,693

Basic (loss) earnings per share	$	(0.08	)	$	0.49	$	0.20	$	0.50
Diluted (loss) earnings per share	$	(0.08	)	$	0.49	$	0.19	$	0.50

Goodwill and Other Intangibles - Summary of Other Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Intangible Assets [Line Items]
Gross Carrying Value	$ 209,565	$ 197,809
Accumulated Amortization	(138,894)	(138,200)
Accumulated impairment	(6,813)	(6,813)
Net Carrying Value	63,858	52,796
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Value	130,196	121,316
Accumulated Amortization	(82,594)	(81,785)
Accumulated impairment	(6,185)	(6,185)
Net Carrying Value	41,417	33,346
Technology
Intangible Assets [Line Items]
Gross Carrying Value	50,501	48,478
Accumulated Amortization	(36,793)	(36,238)
Accumulated impairment	(27)	(27)
Net Carrying Value	13,681	12,213
Product Development Costs
Intangible Assets [Line Items]
Gross Carrying Value	19,095	19,943
Accumulated Amortization	(18,932)	(19,774)
Accumulated impairment	(71)	(71)
Net Carrying Value	92	98
Trade names
Intangible Assets [Line Items]
Gross Carrying Value	1,600
Accumulated Amortization	(21)
Net Carrying Value	1,579
Software Development
Intangible Assets [Line Items]
Gross Carrying Value	1,007	1,007
Accumulated Amortization	(554)	(403)
Net Carrying Value	453	604
Trade Names
Intangible Assets [Line Items]
Gross Carrying Value	7,166	7,065
Accumulated impairment	(530)	(530)
Net Carrying Value	$ 6,636	$ 6,535

Overview - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized payments to customers		$ 21,537		$ 21,537		$ 18,168
Reduction of revenue due to amortization and write-off of previously capitalized payments		$ 704	$ 202	$ 1,679	$ 1,246
Cash proceeds	$ 3,740
Loss on sale					$ 2,311
Entities Ownership Interest
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ownership interest		20.00%		20.00%
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of products expected to be sold		5 years		5 years
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of products expected to be sold		10 years		10 years

Details of Certain Balance Sheet Components (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Other current assets:
Billable tooling	$ 26,054	$ 23,553
Notes receivable	16,486	13,490
Income tax and other tax receivable	15,237	23,826
Prepaid expenses	12,254	9,214
Short-term derivative financial instruments	905	4,521
Other	14,742	7,728
Total other current assets	85,678	82,332
Other current liabilities:
Accrued employee liabilities	52,137	49,924
Liabilities from discounts and rebates	25,204	22,391
Income tax and other taxes payable	21,160	31,172
Accrued warranty	15,936	7,805	$ 7,907	$ 3,507
Restructuring	11,542	6,928
Short-term derivative financial instruments	3,275	775
Merger and acquisition liabilities	1,877	5,254
Other	13,868	9,855
Total other current liabilities	$ 144,999	$ 134,104

Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended				9 Months Ended		15 Months Ended	20 Months Ended
	Aug. 31, 2026	Feb. 28, 2026	Jul. 31, 2025	Feb. 28, 2025	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2026
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					$ 4,838			$ 3,986	$ 17,493	$ 10,608
Cash payments for restructuring expenses					5,352	$ 4,464	$ 2,154
Restructuring expenses recorded					4,838	5,981	6,700
2025 Manufacturing Footprint Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					0				0
Restructuring expenses recorded											$ 2,190
2025 Manufacturing Footprint Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring charges for capital expenditures			$ 2,000
2025 Manufacturing Footprint Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring charges for capital expenditures			1,000
2025 EMEA Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses recorded												$ 7,225
2025 EMEA Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring charges for capital expenditures				$ 2,000
2025 EMEA Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring charges for capital expenditures				1,000
2025 Asia Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses recorded												$ 3,492
Employee Separation Costs
Restructuring Cost And Reserve [Line Items]
Cash payments for restructuring expenses					3,836	2,822	991
Restructuring expenses recorded					2,423	4,339	5,537
Employee Separation Costs \| 2025 Manufacturing Footprint Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses								2,190		2,190
Employee Separation Costs \| 2025 EMEA Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					274			413	984	3,186
Employee Separation Costs \| 2025 Asia Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					0			125	69	2,077
Employee Separation Costs \| Other Restructuring Activities
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					10			(2)	68	1,214
Employee Separation Costs \| Other Restructuring Activities \| Automotive Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses								(0)		(262)
Employee Separation Costs \| 2026 Organizational Realignment Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					17				9,030
Employee Separation Costs \| 2026 Organizational Realignment Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		$ 9,500
Employee Separation Costs \| 2026 Organizational Realignment Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		$ 9,000
Employee Separation Costs \| 2026 Global Production Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					2,122				2,122
Employee Separation Costs \| 2026 Global Production Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 3,500
Employee Separation Costs \| 2026 Global Production Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 3,000
Employee Separation and Retention Costs \| 2025 Manufacturing Footprint Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			4,000
Employee Separation and Retention Costs \| 2025 Manufacturing Footprint Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			3,000
Employee Separation and Retention Costs \| 2025 EMEA Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses				6,000
Employee Separation and Retention Costs \| 2025 EMEA Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses				4,000
Other Restructuring
Restructuring Cost And Reserve [Line Items]
Cash payments for restructuring expenses					1,516	1,642	1,163
Restructuring expenses recorded					2,415	$ 1,642	$ 1,163
Other Restructuring \| 2025 Manufacturing Footprint Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses			$ 1,000
Other Restructuring \| 2025 EMEA Plan \| Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses				3,000
Other Restructuring \| 2025 EMEA Plan \| Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring expenses				$ 2,000
Other Costs \| 2025 EMEA Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					420			480	1,459	813
Other Costs \| 2025 Asia Plan
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					0			273	327	390
Other Costs \| Other Restructuring Activities \| Automotive Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses					$ 1,995			$ 507	$ 3,434	$ 1,000

Acquisitions - Additional Information (Detail) - USD ($)				3 Months Ended	9 Months Ended
	Oct. 01, 2026	Jul. 01, 2026	Jun. 29, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 29, 2026	Sep. 28, 2026	Dec. 31, 2025
Business Combination [Line Items]
Common Stock, par value
Debt instrument, frequency of periodic payment			quarterly
Debt maturity date			Jun. 29, 2031
Common Stock, shares authorized				110,000,000	110,000,000	110,000,000	55,000,000	110,000,000
Goodwill				$ 122,258,000	$ 122,258,000			$ 108,918,000
Delayed Draw Term Loan Facility
Business Combination [Line Items]
Maximum aggregate principal amount			$ 250,000,000
Subsequent Event
Business Combination [Line Items]
Ownership interest of common stock	56.38%
Cash dividend declared	$ 63,500,000
Dividend per share	$ 2.07
Debt instrument description of amortization terms	The Term Loans amortize in equal quarterly installments of 0.625% for the first eight quarters and 1.250% for each quarter thereafter until maturity.
Subsequent Event \| Delayed Draw Term Loan Facility
Business Combination [Line Items]
Maximum aggregate principal amount	$ 250,000,000
Modine
Business Combination [Line Items]
Costs related to transaction				6,344,000	33,396,000
Modine \| Subsequent Event
Business Combination [Line Items]
Stock issued during period	23,735,961
Ownership interest of common stock	43.62%
Cash distribution	$ 155,991,000
Total consideration	$ 800,000,000
Modine \| Subsequent Event \| Common Stock
Business Combination [Line Items]
Stock issued during period	23,735,961
Common Stock, par value	$ 0
IME
Business Combination [Line Items]
Total consideration		$ 34,652,000
Cash payments, net of cash acquired and contingent consideration with fair value		$ 500,000
Goodwill				15,610,000	15,610,000
Intangible assets				$ 15,900,000	$ 15,900,000

Recently Issued Accounting Pronouncements	9 Months Ended
Recently Issued Accounting Pronouncements	Sep. 30, 2026
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recently Issued Accounting Pronouncements	Note 2 – Recently Issued Accounting Pronouncements Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40)". ASU 2024-03 enhances disclosures around certain costs and expenses. Retrospective adoption is required for all periods presented in the financial statements and early adoption is permitted. This update is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. We are currently in the process of determining the impact the implementation of ASU 2024-03 will have on the Company’s financial statement disclosures. Internal-Use Software In September 2025, the FASB issued ASU 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)". ASU 2025-06 modernizes the accounting for internal-use software costs. Retrospective, prospective, or a modified transition approach for adoption are all permitted, as well as early adoption at the beginning of an annual reporting period. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2025-06 will have on the Company’s financial statement disclosures. Environmental Credits and Environmental Credit Obligations In May 2026, the FASB issued ASU 2026-02, “Environmental Credits and Environmental Credit Obligations (Topic 818)”. ASU 2026-02 provides recognition, measurement, presentation, and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2026-02 will have on the Company’s financial statement disclosures.

Reclassifications Out of Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2026

Equity [Abstract]

Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss

Reclassification adjustments and other activities impacting accumulated other comprehensive loss during the three and nine months ended September 30, 2026 and 2025 were as follows:


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at June 30, 2026	$	(1,695	)	$	(10,096	)	$	(114	)		$	(11,905	)
Other comprehensive loss before reclassifications		—			(125	)		(2,061	)			(2,186	)
Income tax effect of other comprehensive loss before reclassifications		—			—			447				447
Amounts reclassified from accumulated other comprehensive loss into net loss		17			—			(275	)	a		(258	)
Income taxes reclassified into net loss		(5	)		—			59				54
Net current period other comprehensive income (loss)		12			(125	)		(1,830	)			(1,943	)
Balance at September 30, 2026	$	(1,683	)	$	(10,221	)	$	(1,944	)		$	(13,848	)

(a)

The amounts reclassified from accumulated other comprehensive loss of $(282) and $7 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at June 30, 2025	$	(1,823	)	$	(45	)	$	3,873			$	2,005
Other comprehensive (loss) income before reclassifications		—			(687	)		2,276				1,589
Income tax effect of other comprehensive (loss) income before reclassifications		—			—			(474	)			(474	)
Amounts reclassified from accumulated other comprehensive income (loss) into net income		21			—			(2,243	)	a		(2,222	)
Income taxes reclassified into net income		(6	)		—			466				460
Net current period other comprehensive income (loss)		15			(687	)		25				(647	)
Balance at September 30, 2025	$	(1,808	)	$	(732	)	$	3,898			$	1,358

(a)

The amounts reclassified from accumulated other comprehensive (loss) income of $2,086 and $156 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2025	$	(1,721	)	$	(2,114	)	$	2,871			$	(964	)
Other comprehensive (loss) income before reclassifications		—			(8,107	)		320				(7,787	)
Income tax effect of other comprehensive (loss) income before reclassifications		—			—			(100	)			(100	)
Amounts reclassified from accumulated other comprehensive (loss) income into net income		52			—			(6,437	)	a		(6,385	)
Income taxes reclassified into net income		(14	)		—			1,402				1,388
Net current period other comprehensive income (loss)		38			(8,107	)		(4,815	)			(12,884	)
Balance at September 30, 2026	$	(1,683	)	$	(10,221	)	$	(1,944	)		$	(13,848	)

(a)

The amounts reclassified from accumulated other comprehensive (loss) income of $(6,469) and $32 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)
Other comprehensive income before reclassifications		—			79,364			11,463				90,827
Income tax effect of other comprehensive income before reclassifications		—			—			(2,423	)			(2,423	)
Amounts reclassified from accumulated other comprehensive income (loss) into net income		59			—			(2,376	)	a		(2,317	)
Income taxes reclassified into net income		(16	)		—			480				464
Net current period other comprehensive income		43			79,364			7,144				86,551
Balance at September 30, 2025	$	(1,808	)	$	(732	)	$	3,898			$	1,358

(a)

The amounts reclassified from accumulated other comprehensive (loss) income of $2,220 and $156 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.

Goodwill and Other Intangibles - Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2026 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 108,918
Balance, end of period	122,258
Operating Segments
Goodwill [Line Items]
Balance, beginning of period	108,918
Acquisition of IME	15,610
Currency translation	(2,270)
Balance, end of period	122,258
Automotive Segments \| Operating Segments
Goodwill [Line Items]
Balance, beginning of period	81,031
Currency translation	(2,550)
Balance, end of period	78,481
Medical Segments \| Operating Segments
Goodwill [Line Items]
Balance, beginning of period	27,887
Acquisition of IME	15,610
Currency translation	280
Balance, end of period	$ 43,777

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
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-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

+ Details

Maturities of Debt (Detail)
$ in Thousands

Sep. 30, 2026

USD ($)

Debt Instrument [Line Items]

Debt maturing in 2026

$ 338

Debt maturing in 2027

1,397

Debt maturing in 2028

1,465

Debt maturing in 2029

1,536

Debt maturing in 2030

1,611

Debt maturing in 2031 or later

328,987

Total

335,334

US and Euro Denominated Revolving Note

Debt Instrument [Line Items]

Debt maturing in 2031 or later

307,000

Total

307,000

Finance Leases

Debt Instrument [Line Items]

Debt maturing in 2026

338

^[1]

Debt maturing in 2027

1,397

^[1]

Debt maturing in 2028

1,465

^[1]

Debt maturing in 2029

1,536

^[1]

Debt maturing in 2030

1,611

^[1]

Debt maturing in 2031 or later

21,987

^[1]

Total

$ 28,334

^[1]

[1]	Inclusive of imputed interest of finance leases.

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2026

Commitments and Contingencies Disclosure [Abstract]

Reconciliation of Changes in Accrued Warranty Costs

The following is a reconciliation of the changes in accrued warranty costs:


	Nine Months Ended September 30,
	2026			2025
Balance at the beginning of the period	$	7,805		$	3,507
Warranty claims paid		(6,561	)		(6,227	)
Warranty expense for products shipped during the current period		7,004			8,345
Adjustments to warranty estimates from prior periods		7,838			2,121
Adjustments due to currency translation		(150	)		161
Balance at the end of the period	$	15,936		$	7,907

Segment Reporting - Product Revenues Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting Information [Line Items]
Product revenues	$ 405,102	$ 386,870	$ 1,214,974	$ 1,115,814
United States
Segment Reporting Information [Line Items]
Product revenues	141,377	139,991	407,717	391,662
China
Segment Reporting Information [Line Items]
Product revenues	74,787	63,679	225,547	167,214
Germany
Segment Reporting Information [Line Items]
Product revenues	32,543	30,300	99,553	86,038
Czech Republic
Segment Reporting Information [Line Items]
Product revenues	20,706	21,437	66,106	66,113
South Korea
Segment Reporting Information [Line Items]
Product revenues	20,594	20,422	61,421	68,288
Mexico
Segment Reporting Information [Line Items]
Product revenues	21,672	18,272	59,020	51,704
Slovakia
Segment Reporting Information [Line Items]
Product revenues	13,939	12,828	45,493	41,121
Japan
Segment Reporting Information [Line Items]
Product revenues	14,135	12,027	38,580	35,805
United Kingdom
Segment Reporting Information [Line Items]
Product revenues	8,878	6,387	30,091	25,538
Netherlands
Segment Reporting Information [Line Items]
Product revenues	7,102	6,724	18,992	21,937
Other
Segment Reporting Information [Line Items]
Product revenues	49,369	54,803	162,454	160,394
Non U.S.
Segment Reporting Information [Line Items]
Product revenues	$ 263,725	$ 246,879	$ 807,257	$ 724,152

New Accounting Pronouncements (Policies)	9 Months Ended
New Accounting Pronouncements (Policies)	Sep. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The unaudited consolidated condensed financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations. The information furnished in the consolidated condensed financial statements include all adjustments (consisting of only normal, recurring adjustments) considered necessary to present fairly the results of operations, financial position and cash flows of the Company. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The operating results for interim periods are not necessarily indicative of results that may be expected for other interim periods or for the full year. In preparing these financial statements, management was required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. These estimates and assumptions are based on our historical experience, the terms of existing contracts, our evaluation of trends in the industry, information provided by our customers and suppliers and information available from other third-party sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty and may change as new events occur and additional information is obtained. As a result, actual results may differ significantly from our estimates, and any such differences may be material to our financial statements. All amounts in these notes to the consolidated condensed financial statements are presented in thousands, except share and per share data.
Principles of Consolidation	Principles of Consolidation The consolidated condensed financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. The Company evaluates its relationship with other entities for consolidation and to identify whether such entities are variable interest entities and to assess whether the Company is the primary beneficiary of such entities. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer.
Revenue Recognition - payments to customers	Revenue Recognition - payments to customers From time to time, the Company provides cash incentives to customers in exchange for new business awards. The Company evaluates the underlying economics of each amount of consideration payable to a customer to determine the proper accounting by understanding the reasons for the payment, the rights and obligations resulting from the payment, the nature of the promises in the contract, and other relevant facts and circumstances. When the Company concludes that the payment is incurred only if the new business is obtained and the Company expects to recover the amounts from the customer over the term of the new business arrangement, the Company recognizes these payments as an asset. The Company amortizes the asset as a reduction of revenue as products related to the payment are transferred to the customer, based on the total amount of products expected to be sold over the term of the arrangement (generally 5 to 10 years following start of production). The Company evaluates the amounts capitalized each reporting period for recoverability and recognizes a reduction of revenue for any amounts that are no longer expected to be recovered over the term of the business arrangement. Payments to customers that are not capitalized are recognized as a reduction to revenue at the time of the commitment to make such payments. As of September 30, 2026 and December 31, 2025, total capitalized payments to customers were $21,537 and $18,168, respectively. During the three and nine months ended September 30, 2026, the Company recognized $704 and $1,679 as reductions of revenue due to amortization and write-off of previously capitalized payments. During the three and nine months ended September 30, 2025, the Company recognized $202 and $1,246 as reductions of revenue due to amortization and write-off of previously capitalized payments. The Company had no other material contract assets or contract liabilities as of September 30, 2026
Loss on Sale of Land and Building, net	Loss on Sale of Land and Building, net In January 2025, we completed the sale of our former headquarters building in Northville, Michigan for cash proceeds of $3,740. As a result, the Company recognized a loss on sale of $2,311 during the nine months ended September 30, 2025.
Disaggregation of Income Statement Expenses	Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40)". ASU 2024-03 enhances disclosures around certain costs and expenses. Retrospective adoption is required for all periods presented in the financial statements and early adoption is permitted. This update is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. We are currently in the process of determining the impact the implementation of ASU 2024-03 will have on the Company’s financial statement disclosures.
Internal-Use Software	Internal-Use Software In September 2025, the FASB issued ASU 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)". ASU 2025-06 modernizes the accounting for internal-use software costs. Retrospective, prospective, or a modified transition approach for adoption are all permitted, as well as early adoption at the beginning of an annual reporting period. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2025-06 will have on the Company’s financial statement disclosures.
Environmental Credits and Environmental Credit Obligations	Environmental Credits and Environmental Credit Obligations In May 2026, the FASB issued ASU 2026-02, “Environmental Credits and Environmental Credit Obligations (Topic 818)”. ASU 2026-02 provides recognition, measurement, presentation, and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2026-02 will have on the Company’s financial statement disclosures.

Restructuring - Summary of Restructuring Activity for All Restructuring Initiatives (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026
Restructuring Cost And Reserve [Line Items]
Balance, beginning of period	$ 12,770	$ 11,348	$ 6,928
Additions, charged to restructuring expenses, net	4,838	5,981	6,700
Cash payments	(5,352)	(4,464)	(2,154)
Change in estimate		(17)	(9)
Non-cash utilization	(646)
Currency translation	(68)	(78)	(117)
Balance, end of period	11,542	12,770	11,348
Employee Separation Costs
Restructuring Cost And Reserve [Line Items]
Balance, beginning of period	12,770	11,348	6,928
Additions, charged to restructuring expenses, net	2,423	4,339	5,537
Cash payments	(3,836)	(2,822)	(991)
Change in estimate		(17)	(9)
Currency translation	(39)	(78)	(117)
Balance, end of period	11,318	12,770	11,348
Other Related Costs, Net
Restructuring Cost And Reserve [Line Items]
Additions, charged to restructuring expenses, net	2,415	1,642	1,163
Cash payments	(1,516)	$ (1,642)	$ (1,163)
Non-cash utilization	(646)
Currency translation	(29)
Balance, end of period	$ 224

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Acquisitions - Summary of Preliminary Allocation of Purchase Consideration to Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Business Combination [Line Items]
Purchase price, cash consideration, net of cash acquired	$ 34,152
Goodwill	$ 122,258	$ 108,918

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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(Loss) Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Earnings Per Share [Abstract]
Potential shares with an anti-dilutive impact	556,475	0	0	0

(Loss) Earnings Per Share

9 Months Ended

Sep. 30, 2026

Earnings Per Share [Abstract]

(Loss) Earnings Per Share

Note 9 – (Loss) Earnings Per Share

Basic (loss) earnings per share are computed by dividing net (loss) income by the weighted average number of shares of the Common Stock, outstanding during the period. The Company’s diluted (loss) earnings per share give effect to all potential shares of Common Stock outstanding during a period that do not have an anti-dilutive impact to the calculation. In computing the diluted (loss) earnings per share, the treasury stock method is used in determining the number of shares assumed to be issued from the exercise of Common Stock equivalents.

The following table illustrates (loss) earnings per share and the weighted average shares outstanding used in calculating basic and diluted (loss) earnings per share:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2026			2025		2026		2025
Net (loss) income	$	(2,590	)	$	14,949	$	6,048	$	15,298

Basic weighted average shares of Common Stock outstanding		30,671,855			30,479,846		30,613,282		30,618,564
Dilutive effect of restricted stock, restricted stock units and performance stock units		—			268,043		464,240		183,129
Diluted weighted average shares of Common Stock outstanding		30,671,855			30,747,889		31,077,522		30,801,693

Basic (loss) earnings per share	$	(0.08	)	$	0.49	$	0.20	$	0.50
Diluted (loss) earnings per share	$	(0.08	)	$	0.49	$	0.19	$	0.50

Securities excluded from the calculation of diluted loss per share were approximately 556,475 for the three months ended September 30, 2026, because the inclusion of such securities in the calculation would have been anti-dilutive. There were no anti-dilutive securities for the nine months ended September 30, 2026 or the three and nine months ended September 30, 2025.

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total debt	$ 320,443	$ 189,073
Less: current maturities	(912)	(73)
Long-term debt, less current maturities	$ 319,531	$ 189,000
Revolving Credit Facility (U.S. Dollar denominations)
Debt Instrument [Line Items]
Interest Rate	5.13%	4.95%
Total debt	$ 307,000	$ 189,000
Finance Leases
Debt Instrument [Line Items]
Interest Rate	10.55%	3.34%
Total debt	$ 13,443	$ 73

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

Segment Reporting - Additional Information (Details)	9 Months Ended
Segment Reporting - Additional Information (Details)	Sep. 30, 2026 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Fair Value Measurements - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Investment made	$ 1,294,000
Fair Value, Recurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	0	$ 0
Financial liabilities, fair value	0	0
Fair Value, Nonrecurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	0	0
Financial liabilities, fair value	$ 0	$ 0

- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References + Details

Income Taxes - Summary of Provision for Income Taxes and Corresponding Effective Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Tax Disclosure [Abstract]
Income tax expense	$ 13,430	$ 5,935	$ 19,730	$ 10,204
Earnings before income tax	$ 10,840	$ 20,884	$ 25,778	$ 25,502
Effective tax rate	123.90%	28.40%	76.50%	40.00%
Total cash paid for income taxes, net of refunds	$ 13,371	$ 9,328	$ 36,412	$ 22,171

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details

Information Related to Effect of Derivative Instruments on Our Consolidated Condensed Statements of income and Consolidated Condensed Statements of Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Foreign Currency Derivatives \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	$ (2,642)	$ 2,177	$ (1,328)	$ 10,117
Foreign Currency Derivatives \| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	282	2,086	6,469	273
Foreign Currency Derivatives \| Location, Statement of Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	(2,924)	91	(7,797)	9,844
Interest Rate Contracts \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	581	98	1,648	(601)
Interest Rate Contracts \| Derivatives Not Designated as Hedging Instruments
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives		(104)		(719)
Interest Rate Contracts \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	(7)	156	(32)	156
Interest Rate Contracts \| Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet \| Derivatives Not Designated as Hedging Instruments
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives		(104)		(719)
Interest Rate Contracts \| Location, Statement of Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax \| Derivatives Designated as Cash Flow Hedges
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	$ 588	$ (58)	$ 1,680	$ (757)

Commitments and Contingencies

9 Months Ended

Sep. 30, 2026

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 8 – Commitments and Contingencies

Legal and Other Contingencies

The Company is subject to various legal actions and claims in the ordinary course of its business, which may include those arising out of breach of contracts, intellectual property rights, environmental matters, regulatory matters and employment-related matters. The Company establishes accruals for matters which it believes that losses are probable and can be reasonably estimated. Although it is not possible to predict with certainty the outcome of these matters, the Company is of the opinion that the ultimate resolution of these matters outstanding as of September 30, 2026 will not have a material adverse effect on its results of operations or financial position. Product liability and warranty reserves are recorded separately from legal reserves.

Product Liability and Warranty Matters

Our products subject us to warranty claims and, from time to time, product liability claims based on the Company’s products alleged failure to perform as expected or resulting in alleged bodily injury or property damage. If any of our products are or are alleged to be defective, we may be required to participate in a recall or other corrective action involving such products. The Company maintains warranty and product liability insurance coverage at levels based on commercial norms and historical claims experience. Such policies may not cover all costs associated with a claim. The Company can provide no assurances that it will not experience material warranty or product liability claims or liabilities in the future or that it will not incur significant costs to defend such claims.

The Company accrues warranty obligations for products sold based on management estimates of future failure rates and current claim cost experience, with support from the sales, engineering, quality and legal functions. Using historical information available to the Company, including any claims filed by customers, the warranty accrual is adjusted quarterly to reflect management’s estimate of future claims.

On February 14, 2024, the National Highway Traffic Safety Administration announced that Volkswagen Group of America, Inc. (“VW”) is recalling 261,257 vehicles from model years 2015-2020 to remedy an alleged problem with a suction jet pump seal inside the fuel tank system. VW informed Gentherm of its plan to conduct the recall on April 3, 2024. The suction jet pump is a product originally designed and manufactured by Alfmeier, the business Gentherm acquired in August 2022. The Company has not accepted any financial responsibility for the recall and is pursuing discussions with VW to advance its position and resolve this matter. No litigation has been threatened or filed as of the date of this report. If the Company is obligated to indemnify VW for the direct and indirect costs associated with the recall, such costs could be material. The Company's insurance policies are not expected to apply to this recall as the production period for the affected parts is outside of the insurance coverage period. The Company’s purchase agreement of Alfmeier includes indemnification provisions under which the Company believes it would have a claim against the sellers that would cover a portion of the potential costs. Given the uncertainty that exists concerning the resolution of this matter, as of

the date of this report, the Company cannot reasonably estimate the amount and timing of possible costs that may be incurred by the Company.

In April 2025, NHTSA announced that VW and Porsche Cars North America, Inc. (“Porsche”) are each recalling vehicles from model years 2022-2023 to remedy a problem with their passenger occupant detection system that is alleged to be affected by the crimp connection of the seat cushion heating mat, which is produced by Gentherm. Total vehicles included in these recall campaigns are 13,508. No litigation has been threatened or filed as of the date of this report and the Company has not accepted any financial responsibility for the recalls. If the Company is obligated to indemnify VW and Porsche for the direct and indirect costs associated with the recall, such costs could be material. Insurance policies, noted above, are expected to apply. Given the uncertainty that exists concerning the resolution of this matter, as of the date of this report, the Company cannot reasonably estimate the amount and timing of possible costs that may be incurred by the Company.

The following is a reconciliation of the changes in accrued warranty costs:


	Nine Months Ended September 30,
	2026			2025
Balance at the beginning of the period	$	7,805		$	3,507
Warranty claims paid		(6,561	)		(6,227	)
Warranty expense for products shipped during the current period		7,004			8,345
Adjustments to warranty estimates from prior periods		7,838			2,121
Adjustments due to currency translation		(150	)		161
Balance at the end of the period	$	15,936		$	7,907

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2026	Oct. 16, 2026
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2026
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q3
Trading Symbol	THRM
Entity Registrant Name	GENTHERM INCORPORATED
Entity Central Index Key	0000903129
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		52,504,512
Entity Shell Company	false
Entity File Number	0-21810
Entity Tax Identification Number	95-4318554
Entity Address, Address Line One	28875 Cabot Drive
Entity Address, City or Town	Novi
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48377
City Area Code	248
Local Phone Number	504-0500
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	MI
Document Quarterly Report	true
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, no par value
Document Transition Report	false

(Loss) Earnings Per Share - (Loss) Earnings per Share and Weighted Average Shares Outstanding Used in Calculating Basic and Diluted (Loss) Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Earnings Per Share [Abstract]
Net (loss) income	$ (2,590)	$ 4,420	$ 4,218	$ 14,949	$ 477	$ (128)	$ 6,048	$ 15,298
Basic weighted average shares of Common Stock outstanding	30,671,855			30,479,846			30,613,282	30,618,564
Dilutive effect of restricted stock, restricted stock units and performance stock units				268,043			464,240	183,129
Diluted weighted average shares of Common Stock outstanding	30,671,855			30,747,889			31,077,522	30,801,693
Basic (loss) earnings per share	$ (0.08)			$ 0.49			$ 0.2	$ 0.5
Diluted (loss) earnings per share	$ (0.08)			$ 0.49			$ 0.19	$ 0.5

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

Fair Value Measurements

9 Months Ended

Sep. 30, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 11 – Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and also considers counterparty credit risk in its assessment of fair value.

Fair value measurements are classified under the following fair value hierarchy:

Level 1: Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.

Level 2: Inputs, other than quoted market prices included in Level 1, that are observable either directly or indirectly for the asset or liability.

Level 3: Unobservable inputs that are used when little or no market data is available. Unobservable inputs are used if there is little or no market data for the asset or liability at the measurement date.

Items Measured at Fair Value on a Recurring Basis

The Company uses an income approach to value derivative instruments, analyzing quoted market prices to calculate the forward values and then discounting such forward values to the present value using benchmark rates at commonly quoted intervals for the instrument’s full term. The Company had no other material financial assets and liabilities that were carried at fair value at September 30, 2026 and December 31, 2025.

Items Measured at Fair Value on a Nonrecurring Basis

The Company measures certain assets and liabilities at fair value on a non-recurring basis. During the nine months ended September 30, 2025, there was a decrease in the fair value of an equity investment of $1,294 due to observable transactions (Level 2), which was recorded in other income (loss). As of September 30, 2026, and December 31, 2025, there were no other significant assets or liabilities measured at fair value on a non-recurring basis.

Items Not Carried at Fair Value

The Company uses an income valuation technique to measure the fair values of its debt instruments by converting amounts of future cash flows to a single present value amount using rates based on current market expectations (Level 2 inputs). As of September 30, 2026, and December 31, 2025, the carrying values of the indebtedness under the Credit Agreement were not materially different than the estimated fair values because the interest rates on variable rate debt approximated rates currently available to the Company (see Note 7, “Debt”).

Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Condensed Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Foreign Currency Derivatives
Derivatives Fair Value [Line Items]
Notional Amount	$ 127,103	$ 35,122
Net Assets/ (Liabilities)	(3,275)	4,521
Foreign Currency Derivatives \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		4,521
Interest Rate Contracts
Derivatives Fair Value [Line Items]
Notional Amount	100,000	100,000
Net Assets/ (Liabilities)	905	(775)
Interest Rate Contracts \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	905
Interest Rate Contracts \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 3,275	$ 775

Segment Reporting

9 Months Ended

Sep. 30, 2026

Segment Reporting [Abstract]

Segment Reporting

Note 15 – Segment Reporting

The Company is organized under two reportable segments: Automotive and Medical.

The Automotive reporting segment is comprised of our global automotive businesses, including the design, development, manufacturing and sales of Automotive Climate and Comfort Solutions (including Climate Control Seats, Climate Control Interiors, Lumbar and Massage Comfort Solutions and Climate and Comfort Electronics), Valve Systems and other automotive products.

The Medical reporting segment is comprised of our patient temperature management business in the medical industry. Patient temperature management includes temperature management systems across multiple product categories addressing the needs of hyper-hypothermia therapy in intensive care, normothermia in surgical procedures and additional warming/cooling therapies utilized in acute and chronic care departments and non-hospital facilities.

The Corporate and other unallocated expenses category includes certain enterprise and governance activities resulting in unallocated corporate costs and other activity and net costs that the Company may choose not to allocate directly to its business segments.

A measure of assets has not been disclosed for each segment as it is not regularly reviewed by our chief operating decision maker.

The table below presents segment information about the reported product revenues, significant segment expenses, operating income (loss) and depreciation and amortization of the Company for the three and nine months ended September 30, 2026 and 2025.


	Three Months Ended September 30,						Nine Months Ended September 30,
	2026			2025			2026			2025
Product Revenues
Automotive	$	390,597		$	374,211		$	1,177,578		$	1,079,937
Medical		14,505			12,659			37,396			35,877
Total		405,102			386,870			1,214,974			1,115,814

Significant Segment Expenses and Operating Performance
Automotive
Cost of sales		302,288			283,663			905,359			822,314
Net research and development expenses		17,776			18,629			58,495			55,831
Selling, general and administrative expenses		13,331			17,013			50,325			49,546
Restructuring expenses, net		4,782			3,972			16,481			10,410
Loss on sale of land and building, net		—			—			—			2,196
Automotive operating income		52,420			50,934			146,918			139,640

Medical
Cost of sales		8,510			6,691			21,657			18,696
Other operating expenses		7,271			5,982			20,306			17,137
Medical operating (loss) income		(1,276	)		(14	)		(4,567	)		44

Corporate and Other Unallocated Expenses
Corporate and other unallocated expenses		36,781			27,062			106,014			74,756
Total consolidated operating income	$	14,363		$	23,858		$	36,337		$	64,928

Other Segment Disclosures
Depreciation and Amortization
Automotive	$	12,952		$	11,990		$	37,483		$	35,388
Medical		1,153			849			2,877			2,555
Corporate		1,352			550			3,841			1,535
Total	$	15,457		$	13,389		$	44,201		$	39,478

Automotive and Medical segment product revenues by product category for the three and nine months ended September 30, 2026 and 2025 were as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Climate Control Seats	$	215,603	$	201,275	$	639,656	$	592,448
Lumbar and Massage Comfort Solutions		70,923		55,799		205,772		153,642
Climate Control Interiors		51,939		52,638		155,241		147,564
Climate and Comfort Electronics		7,925		8,599		25,831		22,220
Automotive Climate and Comfort Solutions		346,390		318,311		1,026,500		915,874
Valve Systems		21,596		24,487		73,271		72,803
Other Automotive		22,611		31,413		77,807		91,260
Subtotal Automotive segment		390,597		374,211		1,177,578		1,079,937
Medical segment		14,505		12,659		37,396		35,877
Total Company	$	405,102	$	386,870	$	1,214,974	$	1,115,814

Revenue (based on shipment destination) by geographic area for the three and nine months ended September 30, 2026 and 2025 is as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
United States	$	141,377	$	139,991	$	407,717	$	391,662
China		74,787		63,679		225,547		167,214
Germany		32,543		30,300		99,553		86,038
Czech Republic		20,706		21,437		66,106		66,113
South Korea		20,594		20,422		61,421		68,288
Mexico		21,672		18,272		59,020		51,704
Slovakia		13,939		12,828		45,493		41,121
Japan		14,135		12,027		38,580		35,805
United Kingdom		8,878		6,387		30,091		25,538
Netherlands		7,102		6,724		18,992		21,937
Other		49,369		54,803		162,454		160,394
Total Non-U.S.		263,725		246,879		807,257		724,152
Total Company	$	405,102	$	386,870	$	1,214,974	$	1,115,814

Property and equipment, net, for each of the geographic areas in which the Company operates as of September 30, 2026 and December 31, 2025 is as follows:


	September 30, 2026		December 31, 2025
Property and equipment, net
Mexico	$	49,986	$	50,506
China		44,344		47,414
Germany		40,966		50,761
United States		38,099		40,361
Vietnam		30,732		19,110
North Macedonia		27,057		29,375
Hungary		8,831		8,617
Czech Republic		8,409		10,513
Morocco		5,228		4,436
Ukraine		5,207		5,467
Other		4,702		4,054
Total	$	263,561	$	270,614

- Definition

The entire disclosure for segment reporting.

+ References

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+ Details

Goodwill and Other Intangibles - Additional Information (Detail) $ in Thousands	Sep. 30, 2026 USD ($)
Customer Relationships
Goodwill [Line Items]
Intangible assets acquired	$ 11,000
Definite-lived assets estimated useful lives	15 years
Technology
Goodwill [Line Items]
Intangible assets acquired	$ 3,300
Definite-lived assets estimated useful lives	8 years
Trade Names
Goodwill [Line Items]
Intangible assets acquired	$ 1,600
Definite-lived assets estimated useful lives	19 years
Medical Segments
Goodwill [Line Items]
Accumulated impairment losses of goodwill	$ 19,509
Automotive Segments
Goodwill [Line Items]
Accumulated impairment losses of goodwill	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Debt - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 29, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Debt maturity date	Jun. 29, 2031
Interest expense, net		$ (3,832)	$ (3,313)	$ (9,755)	$ (10,911)
Third Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		242,141		$ 242,141
Debt instrument extended maturity date				Jun. 29, 2031
Third Amended and Restated Credit Agreement \| Federal Funds Rate
Debt Instrument [Line Items]
Interest rate				0.50%
Third Amended and Restated Credit Agreement \| SOFR Rate
Debt Instrument [Line Items]
Interest rate				1.00%
Base Rate Loans \| Third Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate				0.125%
Base Rate Loans \| Third Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate				1.00%
Term SOFR Rate Loans \| Third Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate				1.125%
Term SOFR Rate Loans \| Third Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate				2.00%
Revolving Credit Facility \| Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000
Revolving Credit Facility \| Letters of Credit and Other Guarantees
Debt Instrument [Line Items]
Line of credit, outstanding amount		$ 4,218		$ 4,218		$ 3,574
Revolving Credit Facility \| Swing Line Loans
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000
Revolving Credit Facility \| Third Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	550,000
Debt issuance cost	$ 2,761
Interest expense, net				$ 75
Revolving Credit Facility \| Third Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage payable on daily unused amounts				0.15%
Revolving Credit Facility \| Third Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage payable on daily unused amounts				0.25%

Equity

9 Months Ended

Sep. 30, 2026

Stockholders' Equity Note [Abstract]

Equity

Note 12 – Equity

In June 2024, the Board of Directors (the “Board”) authorized a stock repurchase program (the “2024 Stock Repurchase Program”) to commence upon expiration of the Company’s prior stock repurchase program on June 30, 2024. Under the 2024 Stock Repurchase Program, the Company was authorized to repurchase up to $150,000 of its issued and outstanding Common Stock over a three-year period, expiring June 30, 2027.

In July 2026, the Board terminated the 2024 Stock Repurchase Program and authorized a new stock repurchase program (the “2026 Stock Repurchase Program”), pursuant to which the Company is authorized to repurchase up to $400,000 of its issued and outstanding Common Stock over a three-year period, expiring July 27, 2029. At the time of termination, the 2024 Stock Repurchase Program had $110,103 of share repurchase authorization remaining.

Repurchases may be made, from time to time, in amounts and at prices the Company deems appropriate, subject to market conditions, applicable legal requirements, debt covenants and other contractual restrictions and other considerations, including certain conditions intended to preserve the intended tax treatment of the Modine Transaction.

During the three and nine months ended September 30, 2026, the Company did not repurchase any shares. During the three and nine months ended September 30, 2025, the Company repurchased $0 and $10,015, respectively, under the 2024 Stock Repurchase Program with an average price paid per share of $26.24. Stock repurchases are subject to excise tax, subject to specified exclusions and adjustments. Excise tax of $0 and $100, respectively, was charged to Common stock for the three and nine months ended September 30, 2025.

On September 29, 2026, in connection with the Modine Transaction and as approved by Gentherm’s shareholders at a special meeting held on September 10, 2026, the Company amended its Second Amended and Restated Articles of Incorporation to increase the number of authorized shares of Gentherm Common Stock from 55,000,000 shares of Common Stock to 110,000,000 shares of Common Stock. On October 1, 2026, as part of the Modine Transaction, the Company issued 23,735,961 shares of Common Stock to the Record Date Modine Shareholders.

Subsequent to September 30, 2026, the Company repurchased $60,000 under the 2026 Stock Repurchase Program with an average price paid per share of $30.82. The 2026 Stock Repurchase Program has $340,000 of repurchase authorization remaining as of the date of this report.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated condensed balance sheet as of September 30, 2026 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Assets/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	127,103	Other current assets	$	—	Other current liabilities	$	3,275	$	(3,275	)
Interest rate contracts	Level 2	$	100,000	Other current assets	$	905	Other current liabilities	$	—	$	905

Information related to the recurring fair value measurement of derivative instruments in the consolidated condensed balance sheet as of December 31, 2025 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Assets/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	35,122	Other current assets	$	4,521	Other current liabilities	$	—	$	4,521
Interest rate contracts	Level 2	$	100,000	Other current assets	$	—	Other current liabilities	$	775	$	(775	)

Information relating to the effect of derivative instruments on the consolidated condensed statements of (loss) income and the consolidated condensed statements of comprehensive (loss) income is as follows:


		Three Months Ended September 30,						Nine Months Ended September 30,
	Location (Income/(Loss))	2026			2025			2026			2025
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Cost of sales	$	282		$	2,086		$	6,469		$	273
	Other comprehensive (loss) income, net of tax		(2,924	)		91			(7,797	)		9,844
Total foreign currency derivatives		$	(2,642	)	$	2,177		$	(1,328	)	$	10,117

Interest rate contracts	Interest expense, net	$	(7	)	$	156		$	(32	)	$	156
	Other comprehensive (loss) income, net of tax		588			(58	)		1,680			(757	)
Total interest rate derivatives		$	581		$	98		$	1,648		$	(601	)

Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Interest expense, net	$	—		$	(104	)	$	—		$	(719	)
Total interest rate derivatives		$	—		$	(104	)	$	—		$	(719	)

Restructuring

9 Months Ended

Sep. 30, 2026

Restructuring and Related Activities [Abstract]

Restructuring

Note 4 – Restructuring

The Company continuously monitors market developments, industry trends and changing customer needs and in response, has taken and may continue to undertake restructuring actions, as necessary, to execute management’s strategy, streamline operations and optimize the Company’s cost structure. Restructuring actions may include the realignment of existing manufacturing footprint, facility closures or similar actions, either in the normal course of business or pursuant to significant restructuring programs.

These actions may result in employees receiving voluntary or involuntary employee termination benefits, which are mainly statutory requirements or other contractual agreements. Voluntary termination benefits are accrued when an employee accepts the related offer. Involuntary termination benefits are accrued upon the commitment to a termination plan and when the benefit arrangement is communicated to affected employees, or when liabilities are determined to be probable and estimable, depending on the existence of a substantive plan for separation or termination.

2026 Global Production Plan

In August 2026, the Company committed to a global restructuring plan to implement a standard organizational structure in all production sites (“2026 Global Production Plan”). The 2026 Global Production Plan is expected to result in structural cost reductions impacting the Company’s global workforce.

The Company expects to incur cash restructuring costs of between $3,000 and $3,500 for employee separation costs. The actions under the 2026 Global Production Plan are expected to be substantially completed by the end of 2026.

During the three and nine months ended September 30, 2026, the Company recognized restructuring expense of $2,122 for employee separation costs.

2026 Organizational Realignment Plan

In February 2026, the Company committed to a restructuring plan to realign its operating model and organizational structure to deliver on its key financial and operational priorities (“2026 Organizational Realignment Plan”). The 2026 Organizational Realignment Plan is expected to result in structural cost reductions impacting the Company’s global salaried workforce.

The Company expects to incur cash restructuring costs of between $9,000 and $9,500 for employee separation costs. The actions under the 2026 Organizational Realignment Plan are expected to be substantially completed by the end of 2026.

During the three and nine months ended September 30, 2026, the Company recognized restructuring expense of $17 and $9,030, respectively, for employee separation costs.

2025 Manufacturing Footprint Plan

In July 2025, the Company committed to a restructuring plan to further optimize the Company’s manufacturing footprint by realigning its global manufacturing capacity (“2025 Manufacturing Footprint Plan”). As a result, the Company will relocate certain manufacturing activities between existing locations.

The Company expects to incur cash restructuring costs of between $3,000 and $4,000 for employee separation and retention costs and $1,000 of other transition costs primarily for machinery and equipment move and set up costs. Additionally, we expect to incur capital expenditures of between $1,000 and $2,000.

During the three and nine months ended September 30, 2026, the Company recognized restructuring expense of $0. During the three and nine months ended September 30, 2025, the Company recognized restructuring expense of $2,190, for employee separation costs.

Since the inception of this program, the Company has recorded $2,190 of restructuring expenses. The actions under the 2025 Manufacturing Footprint Plan are expected to be substantially completed by the end of 2027.

2025 EMEA Plan

In February 2025, the Company committed to a restructuring plan to further optimize the Company’s manufacturing footprint by realigning its manufacturing capacity in Europe (“2025 EMEA Plan”). As a result, the Company will close its facility in Plzeň, Czech Republic and relocate the manufacturing activities into other existing facilities within the region.

The Company expects to incur cash restructuring costs of between $4,000 and $6,000 for employee separation and retention costs and between $2,000 and $3,000 of other transition costs primarily for machinery and equipment move and set up costs. Additionally, we expect to incur capital expenditures of between $1,000 and $2,000.

During the three and nine months ended September 30, 2026, the Company recognized restructuring expense of $274 and $984, respectively, for employee separation costs and $420 and $1,459, respectively, for other costs. During the three and nine months ended September 30, 2025, the Company recognized restructuring expense of $413 and $3,186, respectively, for employee separation costs and $480 and $813, respectively, for other costs.

Since the inception of this program, the Company has recorded $7,225 of restructuring expenses. The remaining actions under the 2025 EMEA Plan are expected to be substantially completed by the end of 2026.

2025 Asia Plan

In February 2025, the Company committed to a restructuring plan to further optimize the Company’s manufacturing footprint by realigning its manufacturing capacity in Asia (“2025 Asia Plan”). As a result, the Company relocated certain manufacturing activities from its facility in Shanghai, China to its facility in Tianjin, China.

During the three and nine months ended September 30, 2026, the Company recognized restructuring expense of $0 and $69, respectively, for employee separation costs and $0 and $327, respectively, for other costs. During the three and nine months ended September 30, 2025, the Company recognized restructuring expense of $125 and $2,077, respectively, for employee separation costs and $273 and $390, respectively, for other costs.

Since the inception of this program, the Company has recorded $3,492 of restructuring expenses. The actions under the 2025 Asia Plan are substantially complete.

Other Restructuring Actions

The Company has undertaken several discrete restructuring actions in an effort to optimize its cost structure.

During the three and nine months ended September 30, 2026, the Company recognized $10 and $68, for employee separation costs related to structural cost reductions impacting the Company’s global salaried workforce. During the three and nine months ended September 30, 2025, the Company recognized $(2) and $1,214, for employee separation costs related to structural cost reductions impacting the Company’s global salaried workforce.

During the three and nine months ended September 30, 2026, the Company’s Automotive segment recognized $1,995 and $3,434, respectively, for other costs, primarily related to the relocation of certain manufacturing to best cost locations. During the three and nine months ended September 30, 2025, the Company’s Automotive segment recognized $0 and $(262), respectively, for employee separation costs and $507 and $1,000, respectively, for other costs, primarily related to the relocation of certain manufacturing to best cost locations.

Restructuring Expenses, Net By Reporting Segment

The following table summarizes restructuring expenses, net for the three and nine months ended September 30, 2026 and 2025 by reporting segment:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Automotive	$	4,782	$	3,972	$	16,481	$	10,410
Medical		3		14		329		170
Corporate		53		—		683		28
Total	$	4,838	$	3,986	$	17,493	$	10,608

Restructuring Liability

Restructuring liabilities are classified as other current liabilities in the consolidated condensed balance sheets. The following table summarizes restructuring activity for all restructuring initiatives for the nine months ended September 30, 2026:


	Employee Separation Costs			Other Related Costs, Net			Total
Balance at December 31, 2025	$	6,928		$	—		$	6,928
Additions, charged to restructuring expenses, net		5,537			1,163			6,700
Cash payments		(991	)		(1,163	)		(2,154	)
Change in estimate		(9	)		—			(9	)
Currency translation		(117	)		—			(117	)
Balance at March 31, 2026	$	11,348		$	—		$	11,348
Additions, charged to restructuring expenses, net		4,339			1,642			5,981
Cash payments		(2,822	)		(1,642	)		(4,464	)
Change in estimate		(17	)		—			(17	)
Currency translation		(78	)		—			(78	)
Balance at June 30, 2026	$	12,770		$	—		$	12,770
Additions, charged to restructuring expenses, net		2,423			2,415			4,838
Cash payments		(3,836	)		(1,516	)		(5,352	)
Non-cash utilization		—			(646	)		(646	)
Currency translation		(39	)		(29	)		(68	)
Balance at September 30, 2026	$	11,318		$	224		$	11,542

Acquisitions - Summary of Preliminary Allocation of Purchase Consideration to Other Intangible Assets Acquired (Detail) $ in Thousands	Sep. 30, 2026 USD ($)
Trade Names
Business Combination [Line Items]
Final Fair Value, Definite-lived	$ 1,600
Customer Related
Business Combination [Line Items]
Final Fair Value, Definite-lived	11,000
Technology
Business Combination [Line Items]
Final Fair Value, Definite-lived	$ 3,300

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Interest Rate Swap
Derivative [Line Items]
Hedge Ineffectiveness Incurred	$ 0	$ 0	$ 0	$ 0

Equity - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
Equity - Additional Information (Detail) - USD ($)	Oct. 22, 2026	Oct. 01, 2026	Jul. 31, 2026	Sep. 30, 2026	Sep. 30, 2025	Jun. 30, 2024	Sep. 30, 2026	Sep. 30, 2025	Sep. 29, 2026	Sep. 28, 2026	Dec. 31, 2025
Class Of Stock [Line Items]
Number of shares repurchased				0			0
Common Stock, shares issued				30,710,902			30,710,902				30,526,231
Common stock, shares authorized				110,000,000			110,000,000		110,000,000	55,000,000	110,000,000
Subsequent Event \| Modine
Class Of Stock [Line Items]
Common stock issued		23,735,961
2024 Stock Repurchase Program
Class Of Stock [Line Items]
Stock repurchase program period						3 years
Stock repurchase program, authorized to repurchase amount					$ 0			$ 10,015,000
Stock repurchase program expiration date							Jun. 30, 2027
Remaining authorized repurchase amount			$ 110,103,000
Shares repurchased average price paid per share					$ 26.24			$ 26.24
Excise tax					$ 0			$ 100,000
2026 Stock Repurchase Program
Class Of Stock [Line Items]
Stock repurchase program period			3 years
Stock repurchase program expiration date							Jul. 27, 2029
2026 Stock Repurchase Program \| Subsequent Event
Class Of Stock [Line Items]
Stock repurchase program, authorized to repurchase amount	$ 60,000,000
Remaining authorized repurchase amount	$ 340,000,000
Shares repurchased average price paid per share	$ 30.82
Maximum \| 2024 Stock Repurchase Program
Class Of Stock [Line Items]
Stock repurchase program, authorized to repurchase amount						$ 150,000,000
Maximum \| 2026 Stock Repurchase Program
Class Of Stock [Line Items]
Stock repurchase program, authorized to repurchase amount			$ 400,000,000

Reclassifications Out of Accumulated Other Comprehensive Loss - Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2026

Jun. 30, 2026

Mar. 31, 2026

Sep. 30, 2025

Jun. 30, 2025

Mar. 31, 2025

Sep. 30, 2026

Sep. 30, 2025

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

$ 723,118

$ 716,470

$ 720,323

$ 699,745

$ 646,528

$ 616,947

$ 720,323

$ 616,947

Other comprehensive (loss) income before reclassifications

(2,186)

1,589

(7,787)

90,827

Income tax effect of other comprehensive (loss) income before reclassifications

447

(474)

(100)

(2,423)

Amounts reclassified from accumulated other comprehensive income (loss) into net income

(258)

(2,222)

(6,385)

(2,317)

Income taxes reclassified into net income (loss)

460

1,388

464

Other comprehensive (loss) income, net of tax

(1,943)

(2,017)

(8,924)

(647)

58,886

28,312

(12,884)

86,551

Ending Balance

721,318

723,118

716,470

717,948

699,745

646,528

721,318

717,948

Defined Benefit Pension Plans

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(1,695)

(1,721)

(1,823)

(1,851)

(1,721)

(1,851)

Amounts reclassified from accumulated other comprehensive income (loss) into net income

Income taxes reclassified into net income (loss)

(5)

(6)

(14)

(16)

Other comprehensive (loss) income, net of tax

Ending Balance

(1,683)

(1,695)

(1,808)

(1,823)

(1,683)

(1,808)

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(10,096)

(2,114)

(45)

(80,096)

(2,114)

(80,096)

Other comprehensive (loss) income before reclassifications

(125)

(687)

(8,107)

79,364

Other comprehensive (loss) income, net of tax

(125)

(687)

(8,107)

79,364

Ending Balance

(10,221)

(10,096)

(732)

(45)

(10,221)

(732)

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(11,905)

(9,888)

(964)

2,005

(56,881)

(85,193)

(964)

(85,193)

Other comprehensive (loss) income, net of tax

(1,943)

(2,017)

(8,924)

(647)

58,886

28,312

Ending Balance

(13,848)

(11,905)

(9,888)

1,358

2,005

(56,881)

(13,848)

1,358

Cash Flow Hedge Derivatives

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(114)

$ 2,871

3,873

$ (3,246)

2,871

(3,246)

Other comprehensive (loss) income before reclassifications

(2,061)

2,276

320

11,463

Income tax effect of other comprehensive (loss) income before reclassifications

447

(474)

(100)

(2,423)

Amounts reclassified from accumulated other comprehensive income (loss) into net income

(275)

^[1]

(2,243)

^[2]

(6,437)

^[3]

(2,376)

^[4]

Income taxes reclassified into net income (loss)

466

1,402

480

Other comprehensive (loss) income, net of tax

(1,830)

(4,815)

7,144

Ending Balance

$ (1,944)

$ (114)

$ 3,898

$ 3,873

$ (1,944)

$ 3,898

[1]	The amounts reclassified from accumulated other comprehensive loss of $(282) and $7 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.
[2]	The amounts reclassified from accumulated other comprehensive (loss) income of $2,086 and $156 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.
[3]	The amounts reclassified from accumulated other comprehensive (loss) income of $(6,469) and $32 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.
[4]	The amounts reclassified from accumulated other comprehensive (loss) income of $2,220 and $156 are included in Cost of sales and Interest expense, net, respectively, in the consolidated condensed statements of (loss) income. Refer to Note 10 “Financial Instruments,” for additional information.

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Current Assets:
Cash and cash equivalents	$ 252,098	$ 160,833
Accounts receivable, net	326,217	281,083
Inventory:
Raw materials	127,403	128,314
Work in process	44,437	35,429
Finished goods	91,647	88,959
Inventory, net	263,487	252,702
Other current assets	85,678	82,332
Total current assets	927,480	776,950
Property and equipment, net	263,561	270,614
Goodwill	122,258	108,918
Other intangible assets, net	63,858	52,796
Operating lease right-of-use assets	48,674	56,524
Deferred income tax assets	93,853	93,552
Other non-current assets	42,615	37,075
Total assets	1,562,299	1,396,429
Current Liabilities:
Accounts payable	298,183	260,487
Current lease liabilities	7,846	9,646
Current maturities of long-term debt	912	73
Other current liabilities	144,999	134,104
Total current liabilities	451,940	404,310
Long-term debt, less current maturities	319,531	189,000
Non-current lease liabilities	42,469	48,105
Pension benefit obligation	3,281	3,748
Other non-current liabilities	23,760	30,943
Total liabilities	840,981	676,106
Common Stock:
No par value; 110,000,000 shares authorized 30,710,902 and 30,526,231 issued and outstanding at September 30, 2026 and December 31, 2025, respectively	13,442	5,611
Paid-in capital	1,590	1,590
Accumulated other comprehensive loss	(13,848)	(964)
Accumulated earnings	720,134	714,086
Total shareholders’ equity	721,318	720,323
Total liabilities and shareholders’ equity	$ 1,562,299	$ 1,396,429

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense	$ 13,430	$ 5,935	$ 19,730	$ 10,204
Earnings before income tax	$ 10,840	$ 20,884	$ 25,778	$ 25,502
Effective tax rate	123.90%	28.40%	76.50%	40.00%
U.S. federal statutory rate	21.00%	21.00%	21.00%	21.00%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

+ Details

Consolidated Condensed Statements of (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Statement [Abstract]
Product revenues	$ 405,102	$ 386,870	$ 1,214,974	$ 1,115,814
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 310,798	$ 291,722	$ 927,016	$ 844,439
Gross margin	94,304	95,148	287,958	271,375
Operating expenses:
Net research and development expenses	23,465	24,429	71,480	71,203
Selling, general and administrative expenses	51,638	42,875	162,648	122,440
Restructuring expenses, net	4,838	3,986	17,493	10,608
Loss on sale of land and building, net				2,196
Total operating expenses	79,941	71,290	251,621	206,447
Operating income	14,363	23,858	36,337	64,928
Interest expense, net	(3,832)	(3,313)	(9,755)	(10,911)
Foreign currency gain (loss)	193	339	(1,104)	(27,391)
Other income (loss)	116		300	(1,124)
Earnings before income tax	10,840	20,884	25,778	25,502
Income tax expense	13,430	5,935	19,730	10,204
Net (loss) income	$ (2,590)	$ 14,949	$ 6,048	$ 15,298
Basic (loss) earnings per share	$ (0.08)	$ 0.49	$ 0.2	$ 0.5
Diluted (loss) earnings per share	$ (0.08)	$ 0.49	$ 0.19	$ 0.5
Weighted average number of shares – basic	30,671,855	30,479,846	30,613,282	30,618,564
Weighted average number of shares – diluted	30,671,855	30,747,889	31,077,522	30,801,693

Debt

9 Months Ended

Sep. 30, 2026

Debt Disclosure [Abstract]

Debt

Note 7 – Debt

The following table summarizes the Company’s debt as of September 30, 2026 and December 31, 2025:


	September 30, 2026						December 31, 2025
	Interest Rate			Principal Balance			Interest Rate			Principal Balance
Revolving Credit Facility (U.S. Dollar denominations)		5.13	%	$	307,000			4.95	%	$	189,000
Finance leases		10.55	%		13,443			3.34	%		73
Total debt					320,443						189,073
Less: current maturities					(912	)					(73	)
Long-term debt, less current maturities				$	319,531					$	189,000

Credit Agreement

On June 29, 2026, the Company entered into a Third Amended and Restated Credit Agreement (amending and restating in its entirety the Second Amended and Restated Credit Agreement, dated as of June 10, 2022, as amended) described below (the “Credit Agreement”) with a consortium of lenders and Bank of America, N.A., as administrative agent (the “Agent”). The amendment, among other things, extended the maturity date to June 29, 2031.

The Credit Agreement provides for a $550,000 secured revolving credit facility (the “Revolving Credit Facility”), with a $50,000 sublimit for swing line loans and a $30,000 sublimit for the issuance of letters of credit. Any amount of the facility utilized for swing line loans or letters of credit outstanding will reduce the amount available under the Credit Agreement. Gentherm can increase the Revolving Credit Facility or establish incremental facilities subject to specified conditions.

Under the Credit Agreement, all obligations are unconditionally guaranteed by certain of the Company’s subsidiaries and a security interest is granted in substantially all of the personal property of the Company and its U.S. subsidiaries designated as borrowers or guarantors, including the stock and membership interests of specified subsidiaries. The Credit Agreement contains covenants that, among other things, (i) prohibit or limit the ability to incur additional indebtedness, create liens, pay dividends, make certain types of investments, enter into certain types of transactions with affiliates, prepay other indebtedness, sell assets or enter into certain other transactions outside the ordinary course of business, and (ii) require that Gentherm maintain a minimum Consolidated Interest Coverage Ratio and a maximum Consolidated Net Leverage Ratio (based on consolidated EBITDA for the applicable trailing four fiscal quarters) as of the end of any fiscal quarter. The Credit Agreement also contains customary events of default.

As of September 30, 2026, the Company was in compliance with the terms of the Credit Agreement.

Under the Credit Agreement, U.S. Dollar denominated loans bear interest at either a base rate (“Base Rate Loans”) or Term Secured Overnight Financing Rate (“Term SOFR Rate Loans”), plus a margin (“Applicable Rate”). The rate for Base Rate Loans is equal to the highest of the Federal Funds Rate plus 0.50%, Bank of America’s prime rate, or the Term SOFR rate plus 1.00%. The rate for Term SOFR Rate Loans denominated in U.S. Dollars is equal to the forward-looking Term SOFR rate administered by the Chicago Mercantile Exchange with a term of one month. All loans denominated in a currency other than the U.S. Dollar must use the term Canadian Overnight Repo Rate Average, Euro Interbank Offered Rate, or Sterling Overnight Index Average (depending on the currency of the borrowing), plus the Applicable Rate. Additionally, a commitment fee of between 0.150% to 0.250% is payable on the daily unused amounts under the Revolving Credit Facility.

The Applicable Rate varies based on the Consolidated Net Leverage Ratio reported by the Company. As long as the Company is not in default of the terms and conditions of the Credit Agreement, the lowest and highest possible Applicable Rate is 1.125% and 2.000%, respectively, for Term SOFR Rate Loans and 0.125% and 1.000%, respectively, for Base Rate Loans.

Based upon consolidated EBITDA for the trailing four fiscal quarters calculated for purposes of the Consolidated Net Leverage Ratio, $242,141 remained available for additional borrowings as of September 30, 2026.

The Company had $4,218 and $3,574 of outstanding letters of credit and other guarantees issued as of September 30, 2026 and December 31, 2025, respectively.

In connection with the Third Amended and Restated Credit Agreement, the Company incurred debt issuance costs of $2,761, which have been capitalized and will be amortized into interest expense over the term of the Revolving Credit Facility. In addition, unamortized deferred debt issuance costs of $75 were written-off and recognized in Interest expense, net during the nine months ended September 30, 2026.

The scheduled maturities of our debt as of September 30, 2026 were as follows:


	Revolving Credit Facility		Finance Leases*		Total
2026	$	—	$	338	$	338
2027		—		1,397		1,397
2028		—		1,465		1,465
2029		—		1,536		1,536
2030		—		1,611		1,611
2031 or later		307,000		21,987		328,987
Total	$	307,000	$	28,334	$	335,334

*Inclusive of imputed interest of finance leases.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section S50
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-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Details of Certain Balance Sheet Components

9 Months Ended

Sep. 30, 2026

Balance Sheet Components [Abstract]

Details of Certain Balance Sheet Components

Note 5 – Details of Certain Balance Sheet Components


	September 30, 2026		December 31, 2025
Other current assets:
Billable tooling	$	26,054	$	23,553
Notes receivable		16,486		13,490
Income tax and other tax receivable		15,237		23,826
Prepaid expenses		12,254		9,214
Short-term derivative financial instruments		905		4,521
Other		14,742		7,728
Total other current assets	$	85,678	$	82,332
Other current liabilities:
Accrued employee liabilities	$	52,137	$	49,924
Liabilities from discounts and rebates		25,204		22,391
Income tax and other taxes payable		21,160		31,172
Accrued warranty		15,936		7,805
Restructuring		11,542		6,928
Short-term derivative financial instruments		3,275		775
Merger and acquisition liabilities		1,877		5,254
Other		13,868		9,855
Total other current liabilities	$	144,999	$	134,104

Income Taxes

9 Months Ended

Sep. 30, 2026

Income Tax Disclosure [Abstract]

Income Taxes

Note 14 – Income Taxes

At the end of each interim period, the Company makes an estimate of the annual expected effective income tax rate and applies that rate to its ordinary year-to-date earnings or loss. The income tax provision or benefit related to unusual or infrequent items, if applicable, that will be separately reported or reported net of their related tax effects are individually computed and recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates, tax status, judgment on the realizability of a beginning-of-the-year deferred tax asset in future years or income tax contingencies is recognized in the interim period in which the change occurs.

The computation of the annual expected effective income tax rate at each interim period requires certain estimates and assumptions including, but not limited to, the expected pre-tax income (or loss) for the year, projections of the proportion of income (and/or loss) earned and taxed in respective jurisdictions, permanent and temporary differences, and the likelihood of the realizability of deferred tax assets generated in the current year. Jurisdictions with a projected loss for the year for which no tax benefit can be recognized due to a valuation allowance are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter, based upon the composition and timing of actual earnings compared to annual projections. The estimates used to compute the provision or benefit for income taxes may change as new events occur, additional information is obtained or as our tax environment changes. To the extent that the expected annual effective

income tax rate changes, the effect of the change on prior interim periods is included in the income tax provision in the period in which the change in estimate occurs.

A summary of the provision for income taxes and the corresponding effective tax rate for the three and nine months ended September 30, 2026 and 2025, is shown below:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2026			2025			2026			2025
Income tax expense	$	13,430		$	5,935		$	19,730		$	10,204
Earnings before income tax	$	10,840		$	20,884		$	25,778		$	25,502
Effective tax rate		123.9	%		28.4	%		76.5	%		40.0	%

Total cash paid for income taxes, net of refunds	$	13,371		$	9,328		$	36,412		$	22,171

Income tax expense was $13,430 for the three months ended September 30, 2026 on earnings before income tax of $10,840, representing an effective tax rate of 123.9%. The effective tax rate differed from the U.S. Federal statutory rate of 21.0% primarily due to the impact of income taxes on foreign earnings taxed at rates varying from the U.S. Federal statutory rate and the unfavorable impact of transactions costs incurred in connection with the Modine Transaction.

Income tax expense was $5,935 for the three months ended September 30, 2025 on earnings before income tax of $20,884, representing an effective tax rate of 28.4%. The effective tax rate differed from the U.S. Federal statutory rate of 21.0% primarily due to the impact of income taxes on foreign earnings taxed at rates varying from the U.S. Federal statutory rate and the unfavorable impact of global intangible low-tax income (“GILTI”) and Subpart F income.

Income tax expense was $19,730 for the nine months ended September 30, 2026 on earnings before income tax of $25,778, representing an effective tax rate of 76.5%. The effective tax rate differed from the U.S. Federal statutory rate of 21.0% primarily due to the impact of income taxes on foreign earnings taxed at rates varying from the U.S. Federal statutory rate and the unfavorable impact of transactions costs incurred in connection with the Modine Transaction.

Income tax expense was $10,204 for the nine months ended September 30, 2025 on earnings before income tax of $25,502, representing an effective tax rate of 40.0%. The effective tax rate differed from the U.S. Federal statutory rate of 21.0% primarily due to the unfavorable impact of GILTI and Subpart F income, unfavorable tax effects of equity vesting and a valuation allowance established in the U.S. related to a capital loss carryforward.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting Information [Line Items]
Product revenues	$ 405,102	$ 386,870	$ 1,214,974	$ 1,115,814
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	390,597	374,211	1,177,578	1,079,937
Automotive Segments \| Climate Control Seats
Segment Reporting Information [Line Items]
Product revenues	215,603	201,275	639,656	592,448
Automotive Segments \| Lumbar and Massage Comfort Solutions
Segment Reporting Information [Line Items]
Product revenues	70,923	55,799	205,772	153,642
Automotive Segments \| Climate Control Interiors
Segment Reporting Information [Line Items]
Product revenues	51,939	52,638	155,241	147,564
Automotive Segments \| Climate and Comfort Electronics
Segment Reporting Information [Line Items]
Product revenues	7,925	8,599	25,831	22,220
Automotive Segments \| Automotive Climate and Comfort Solutions
Segment Reporting Information [Line Items]
Product revenues	346,390	318,311	1,026,500	915,874
Automotive Segments \| Valve Systems
Segment Reporting Information [Line Items]
Product revenues	21,596	24,487	73,271	72,803
Automotive Segments \| Other Automotive
Segment Reporting Information [Line Items]
Product revenues	22,611	31,413	77,807	91,260
Medical Segments \| Medical
Segment Reporting Information [Line Items]
Product revenues	$ 14,505	$ 12,659	$ 37,396	$ 35,877

Restructuring - Summary of Restructuring Expenses, Net by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 4,838	$ 3,986	$ 17,493	$ 10,608
Operating Segments \| Automotive Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	4,782	3,972	16,481	10,410
Operating Segments \| Medical Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	3	$ 14	329	170
Operating Segments \| Corporate Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 53		$ 683	$ 28

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2026

Segment Reporting [Abstract]

Segment Information about Reported Product Revenues,Depreciation and Amortization and Operating Income (loss)


	Three Months Ended September 30,						Nine Months Ended September 30,
	2026			2025			2026			2025
Product Revenues
Automotive	$	390,597		$	374,211		$	1,177,578		$	1,079,937
Medical		14,505			12,659			37,396			35,877
Total		405,102			386,870			1,214,974			1,115,814

Significant Segment Expenses and Operating Performance
Automotive
Cost of sales		302,288			283,663			905,359			822,314
Net research and development expenses		17,776			18,629			58,495			55,831
Selling, general and administrative expenses		13,331			17,013			50,325			49,546
Restructuring expenses, net		4,782			3,972			16,481			10,410
Loss on sale of land and building, net		—			—			—			2,196
Automotive operating income		52,420			50,934			146,918			139,640

Medical
Cost of sales		8,510			6,691			21,657			18,696
Other operating expenses		7,271			5,982			20,306			17,137
Medical operating (loss) income		(1,276	)		(14	)		(4,567	)		44

Corporate and Other Unallocated Expenses
Corporate and other unallocated expenses		36,781			27,062			106,014			74,756
Total consolidated operating income	$	14,363		$	23,858		$	36,337		$	64,928

Other Segment Disclosures
Depreciation and Amortization
Automotive	$	12,952		$	11,990		$	37,483		$	35,388
Medical		1,153			849			2,877			2,555
Corporate		1,352			550			3,841			1,535
Total	$	15,457		$	13,389		$	44,201		$	39,478

Segment Information About Reported Segment Product Revenues by Product Category

Automotive and Medical segment product revenues by product category for the three and nine months ended September 30, 2026 and 2025 were as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Climate Control Seats	$	215,603	$	201,275	$	639,656	$	592,448
Lumbar and Massage Comfort Solutions		70,923		55,799		205,772		153,642
Climate Control Interiors		51,939		52,638		155,241		147,564
Climate and Comfort Electronics		7,925		8,599		25,831		22,220
Automotive Climate and Comfort Solutions		346,390		318,311		1,026,500		915,874
Valve Systems		21,596		24,487		73,271		72,803
Other Automotive		22,611		31,413		77,807		91,260
Subtotal Automotive segment		390,597		374,211		1,177,578		1,079,937
Medical segment		14,505		12,659		37,396		35,877
Total Company	$	405,102	$	386,870	$	1,214,974	$	1,115,814

Product Revenues Information by Geographic Area

Revenue (based on shipment destination) by geographic area for the three and nine months ended September 30, 2026 and 2025 is as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
United States	$	141,377	$	139,991	$	407,717	$	391,662
China		74,787		63,679		225,547		167,214
Germany		32,543		30,300		99,553		86,038
Czech Republic		20,706		21,437		66,106		66,113
South Korea		20,594		20,422		61,421		68,288
Mexico		21,672		18,272		59,020		51,704
Slovakia		13,939		12,828		45,493		41,121
Japan		14,135		12,027		38,580		35,805
United Kingdom		8,878		6,387		30,091		25,538
Netherlands		7,102		6,724		18,992		21,937
Other		49,369		54,803		162,454		160,394
Total Non-U.S.		263,725		246,879		807,257		724,152
Total Company	$	405,102	$	386,870	$	1,214,974	$	1,115,814

Schedule of Property and Equipment, Net by Geographic Area

Property and equipment, net, for each of the geographic areas in which the Company operates as of September 30, 2026 and December 31, 2025 is as follows:


	September 30, 2026		December 31, 2025
Property and equipment, net
Mexico	$	49,986	$	50,506
China		44,344		47,414
Germany		40,966		50,761
United States		38,099		40,361
Vietnam		30,732		19,110
North Macedonia		27,057		29,375
Hungary		8,831		8,617
Czech Republic		8,409		10,513
Morocco		5,228		4,436
Ukraine		5,207		5,467
Other		4,702		4,054
Total	$	263,561	$	270,614

- Definition

Tabular disclosure of segment reporting. Includes, but is not limited to, reconciliation of reportable segment amount to corresponding consolidated total.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-34

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

+ Details

Segment Reporting - Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Product Revenues
Product revenues	$ 405,102	$ 386,870	$ 1,214,974	$ 1,115,814
Significant Segment Expenses and Operating Performance
Cost of sales	310,798	291,722	927,016	844,439
Net research and development expenses	23,465	24,429	71,480	71,203
Selling, general and administrative expenses	51,638	42,875	162,648	122,440
Restructuring expenses, net	4,838	3,986	17,493	10,608
Loss on sale of land and building, net				2,196
Operating income (loss)	14,363	23,858	36,337	64,928
Other segment disclosures
Depreciation and amortization	15,457	13,389	44,201	39,478
Operating Segments
Product Revenues
Product revenues	405,102	386,870	1,214,974	1,115,814
Corporate and Other Unallocated Expenses
Significant Segment Expenses and Operating Performance
Other operating expenses	36,781	27,062	106,014	74,756
Other segment disclosures
Depreciation and amortization	1,352	550	3,841	1,535
Automotive Segments
Product Revenues
Product revenues	390,597	374,211	1,177,578	1,079,937
Automotive Segments \| Operating Segments
Product Revenues
Product revenues	390,597	374,211	1,177,578	1,079,937
Significant Segment Expenses and Operating Performance
Cost of sales	302,288	283,663	905,359	822,314
Net research and development expenses	17,776	18,629	58,495	55,831
Selling, general and administrative expenses	13,331	17,013	50,325	49,546
Restructuring expenses, net	4,782	3,972	16,481	10,410
Loss on sale of land and building, net				2,196
Operating income (loss)	52,420	50,934	146,918	139,640
Other segment disclosures
Depreciation and amortization	12,952	11,990	37,483	35,388
Medical Segments \| Operating Segments
Product Revenues
Product revenues	14,505	12,659	37,396	35,877
Significant Segment Expenses and Operating Performance
Cost of sales	8,510	6,691	21,657	18,696
Restructuring expenses, net	3	14	329	170
Other operating expenses	7,271	5,982	20,306	17,137
Operating income (loss)	(1,276)	(14)	(4,567)	44
Other segment disclosures
Depreciation and amortization	1,153	$ 849	2,877	2,555
Corporate Segments \| Operating Segments
Significant Segment Expenses and Operating Performance
Restructuring expenses, net	$ 53		$ 683	$ 28

Acquisitions

9 Months Ended

Sep. 30, 2026

Business Combination [Abstract]

Acquisitions

Note 3 – Acquisitions

Modine Transaction

On October 1, 2026 (the “Closing Date”), the Company completed its previously announced combination of Performance Technologies with the Company (the “Modine Transaction”). The Modine Transaction was structured as a Reverse Morris Trust transaction, where a wholly owned subsidiary of Modine (“SpinCo”), owning Performance Technologies, was spun off to Modine shareholders (the “Distribution”) and immediately thereafter merged with a wholly owned subsidiary of the Company, with SpinCo as the surviving entity becoming a wholly owned subsidiary of the Company (the “Merger”). The Company issued 23,735,961 shares of the Company’s common stock, no par value (“Common Stock” or “Gentherm Common Stock”) to the Modine shareholders of record as of close of business on September 28, 2026 (the “Record Date”, and such holders of Modine common stock as of the Record Date, the “Record Date Modine Shareholders”). Upon completion of the Modine Transaction, the Record Date Modine Shareholders owned approximately 43.62% of the outstanding shares of Gentherm Common Stock (without taking into account any overlapping shareholder ownership), and continuing Gentherm shareholders owned approximately 56.38% of the outstanding shares of Gentherm Common Stock (without taking into account any overlapping shareholder ownership). The preliminary estimate of purchase consideration is approximately $800,000, subject to customary closing adjustments.

Prior to the Distribution and the Merger, SpinCo made a cash distribution to Modine of $155,991 (the “SpinCo Cash Distribution”). In connection with the Modine Transaction, the Company also declared a special cash dividend (the “Cash Dividend”) in an aggregate amount equal to $63,500, or $2.07 per share of Gentherm Common Stock. The Cash Dividend was paid in cash on October 7, 2026, to Gentherm shareholders of record as of the close of business on September 28, 2026.

On June 29, 2026, SpinCo entered into a credit agreement, providing for a senior secured delayed-draw term loan facility with aggregate commitments of up to $250,000 (the "DDTL Facility"). On the Closing Date, SpinCo borrowed $250,000 of term loans under the DDTL Facility (the “Term Loans”), the proceeds of which were used by SpinCo on the Closing Date to pay the SpinCo Cash Distribution and other amounts required at closing, such as the estimated net working capital adjustment. Remaining proceeds will be used for general corporate purposes. Upon completion of the Modine Transaction, this represents indebtedness of a wholly owned subsidiary of the Company. The obligations under the DDTL Facility are unconditionally guaranteed by Gentherm and certain of Gentherm’s wholly-owned domestic subsidiaries, subject to customary exceptions, and are secured by substantially all of the assets of SpinCo, Gentherm and the other guarantors, subject to customary exceptions. The Term Loans amortize in equal quarterly installments of 0.625% for the first eight quarters and 1.250% for each quarter thereafter until maturity. The remaining balance becomes due on June 29, 2031.

Due to the proximity of the Closing Date with the date of filing of this report, the initial accounting for the Modine Transaction is not yet completed. As a result, it is not practicable to disclose the preliminary allocation of the purchase price to assets acquired and liabilities assumed, or to provide other related disclosures. The accounting impact of the Modine Transaction will be included in the consolidated financial statements beginning in the Company's fourth quarter of 2026.

During the three and nine months ended September 30, 2026, the Company incurred $6,344 and $33,396, respectively, of costs related to the Modine Transaction. Such fees are recorded in Selling, general and administrative expenses.

Innovative Medical Equipment, LLC

On July 1, 2026, the Company acquired all of the membership interests in Innovative Medical Equipment, LLC (“IME”), a provider of the ThermaZone® thermal therapy device. ThermaZone is a non-opioid thermal therapy solution designed to support pain management and recovery through controlled hot-and-cold therapy. The total consideration was $34,652, which is comprised of cash payments, net of cash acquired, and contingent consideration with a fair value of $500.

The acquisition was accounted for as a business combination within our Medical segment, with the purchase price allocated on a preliminary basis using information available as of September 30, 2026, which primarily resulted in the recognition of other intangible assets of $15,900 and goodwill of $15,610. The estimated fair value of the other intangible assets was based on third-party valuations and management’s estimates, generally utilizing income and market approaches. Goodwill recognized in this transaction is primarily attributable to the Company’s expected future economic benefits from the enhanced access to high-growth markets including private label opportunities through IME’s ThermaZone technology. The goodwill is expected to be deductible for tax purposes.

The pro forma effects of this acquisition would not materially impact the Company’s reported results for any period presented, and as a result no pro forma financial statements are presented herein.

- Definition

The entire disclosure for business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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+ Details

Consolidated Condensed Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings
Beginning Balance at Dec. 31, 2024	$ 616,947	$ 2,049	$ 4,290	$ (85,193)	$ 695,801
Beginning Balance (in shares) at Dec. 31, 2024		30,789,000
Net income (loss)	(128)				(128)
Other comprehensive income (loss)	28,312			28,312
Stock based compensation, net	1,397	$ 1,397
Stock based compensation, net, shares		70,000
Ending Balance at Mar. 31, 2025	646,528	$ 3,446	4,290	(56,881)	695,673
Ending Balance (in shares) at Mar. 31, 2025		30,859,000
Beginning Balance at Dec. 31, 2024	616,947	$ 2,049	4,290	(85,193)	695,801
Beginning Balance (in shares) at Dec. 31, 2024		30,789,000
Net income (loss)	15,298
Other comprehensive income (loss)	86,551
Ending Balance at Sep. 30, 2025	717,948	$ 3,901	1,590	1,358	711,099
Ending Balance (in shares) at Sep. 30, 2025		30,525,000
Beginning Balance at Mar. 31, 2025	646,528	$ 3,446	4,290	(56,881)	695,673
Beginning Balance (in shares) at Mar. 31, 2025		30,859,000
Net income (loss)	477				477
Other comprehensive income (loss)	58,886			58,886
Stock based compensation, net	3,869	$ 3,869
Stock based compensation, net, shares		43,000
Stock repurchase	(10,015)	$ (7,315)	(2,700)
Stock repurchase (in shares)		(382,000)
Ending Balance at Jun. 30, 2025	699,745		1,590	2,005	696,150
Ending Balance (in shares) at Jun. 30, 2025		30,520,000
Net income (loss)	14,949				14,949
Other comprehensive income (loss)	(647)			(647)
Stock based compensation, net	3,901	$ 3,901
Stock based compensation, net, shares		5,000
Ending Balance at Sep. 30, 2025	717,948	$ 3,901	1,590	1,358	711,099
Ending Balance (in shares) at Sep. 30, 2025		30,525,000
Beginning Balance at Dec. 31, 2025	$ 720,323	$ 5,611	1,590	(964)	714,086
Beginning Balance (in shares) at Dec. 31, 2025	30,526,231	30,526,000
Net income (loss)	$ 4,218				4,218
Other comprehensive income (loss)	(8,924)			(8,924)
Stock based compensation, net	853	$ 853
Stock based compensation, net, shares		141,000
Ending Balance at Mar. 31, 2026	716,470	$ 6,464	1,590	(9,888)	718,304
Ending Balance (in shares) at Mar. 31, 2026		30,667,000
Beginning Balance at Dec. 31, 2025	$ 720,323	$ 5,611	1,590	(964)	714,086
Beginning Balance (in shares) at Dec. 31, 2025	30,526,231	30,526,000
Net income (loss)	$ 6,048
Other comprehensive income (loss)	(12,884)
Ending Balance at Sep. 30, 2026	$ 721,318	$ 13,442	1,590	(13,848)	720,134
Ending Balance (in shares) at Sep. 30, 2026	30,710,902	30,711,000
Beginning Balance at Mar. 31, 2026	$ 716,470	$ 6,464	1,590	(9,888)	718,304
Beginning Balance (in shares) at Mar. 31, 2026		30,667,000
Net income (loss)	4,420				4,420
Other comprehensive income (loss)	(2,017)			(2,017)
Stock based compensation, net	4,245	$ 4,245
Stock based compensation, net, shares		38,000
Ending Balance at Jun. 30, 2026	723,118	$ 10,709	1,590	(11,905)	722,724
Ending Balance (in shares) at Jun. 30, 2026		30,705,000
Net income (loss)	(2,590)				(2,590)
Other comprehensive income (loss)	(1,943)			(1,943)
Stock based compensation, net	2,733	$ 2,733
Stock based compensation, net, shares		6,000
Ending Balance at Sep. 30, 2026	$ 721,318	$ 13,442	$ 1,590	$ (13,848)	$ 720,134
Ending Balance (in shares) at Sep. 30, 2026	30,710,902	30,711,000

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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- Definition

Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Number of shares that have been repurchased and retired during the period.

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+ Details

- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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+ Details

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Operating Activities:
Net income	$ 6,048	$ 15,298
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,201	39,478
Deferred income taxes	(9,548)	(12,836)
Stock based compensation	10,371	10,573
Loss on disposition of property and equipment	121	2,671
Provisions for inventory	4,086	5,234
Other non-cash items, including unrealized foreign currency (gain) loss	(1,018)	30,957
Changes in assets and liabilities:
Accounts receivable, net	(43,474)	(20,543)
Inventory	(22,133)	(20,136)
Other assets	(1,403)	(22,325)
Accounts payable	43,305	33,514
Other liabilities	5,451	25,935
Net cash provided by operating activities	36,007	87,820
Investing Activities:
Purchases of property and equipment	(22,558)	(33,378)
Proceeds from the sale of property and equipment	83	3,770
Acquisition of business, net of cash acquired	(34,152)
Cost of technology investments	(121)	(915)
Proceeds from deferred purchase price of factored receivables		744
Net cash used in investing activities	(56,748)	(29,779)
Financing Activities:
Borrowings on debt	204,000	72,000
Repayments of debt	(85,887)	(103,112)
Cash paid for financing new loans	(2,761)
Taxes withheld and paid on employees' stock-based compensation	(2,540)	(1,306)
Cash paid for the repurchase of Common Stock		(10,015)
Net cash provided by (used in) financing activities	112,812	(42,433)
Foreign currency effect	(806)	4,508
Net increase in cash and cash equivalents	91,265	20,116
Cash and cash equivalents at beginning of period	160,833	134,134
Cash and cash equivalents at end of period	252,098	154,250
Supplemental disclosure of cash flow information:
Cash paid for interest	9,059	9,835
Non-Cash Investing Activities:
Period-end balance of accounts payable for property and equipment	$ 3,794	$ 2,959

Consolidated Condensed Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2026	Sep. 29, 2026	Sep. 28, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Common Stock, par value
Common Stock, shares authorized	110,000,000	110,000,000	55,000,000	110,000,000
Common Stock, shares issued	30,710,902			30,526,231
Common Stock, shares outstanding	30,710,902			30,526,231

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

+ Details

Debt (Tables)

9 Months Ended

Sep. 30, 2026

Debt Disclosure [Abstract]

Summary of Company's Debt

The following table summarizes the Company’s debt as of September 30, 2026 and December 31, 2025:


	September 30, 2026						December 31, 2025
	Interest Rate			Principal Balance			Interest Rate			Principal Balance
Revolving Credit Facility (U.S. Dollar denominations)		5.13	%	$	307,000			4.95	%	$	189,000
Finance leases		10.55	%		13,443			3.34	%		73
Total debt					320,443						189,073
Less: current maturities					(912	)					(73	)
Long-term debt, less current maturities				$	319,531					$	189,000

Maturities of Debt

The scheduled maturities of our debt as of September 30, 2026 were as follows:


	Revolving Credit Facility		Finance Leases*		Total
2026	$	—	$	338	$	338
2027		—		1,397		1,397
2028		—		1,465		1,465
2029		—		1,536		1,536
2030		—		1,611		1,611
2031 or later		307,000		21,987		328,987
Total	$	307,000	$	28,334	$	335,334

*Inclusive of imputed interest of finance leases.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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-Topic 942
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+ Details

Details of Certain Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2026

Balance Sheet Components [Abstract]

Summary of Certain Balance Sheet Components

September 30, 2026

December 31, 2025

Other current assets:

Billable tooling

26,054

23,553

Notes receivable

16,486

13,490

Income tax and other tax receivable

15,237

23,826

Prepaid expenses

12,254

9,214

Short-term derivative financial instruments

905

4,521

Other

14,742

7,728

Total other current assets

85,678

82,332

Other current liabilities:

Accrued employee liabilities

52,137

49,924

Liabilities from discounts and rebates

25,204

22,391

Income tax and other taxes payable

21,160

31,172

Accrued warranty

15,936

7,805

Restructuring

11,542

6,928

Short-term derivative financial instruments

3,275

775

Merger and acquisition liabilities

1,877

5,254

Other

13,868

9,855

Total other current liabilities

144,999

134,104

Financial Instruments

9 Months Ended

Sep. 30, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Note 10 – Financial Instruments

Derivative Financial Instruments

The Company is exposed to various market risks including, but not limited to, changes in foreign currency exchange rates, changes in interest rates and price fluctuations of certain material commodities.

The Company regularly enters into derivative contracts with the objective of managing its financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the financial instruments used to hedge them. The decision of whether and when to execute derivative financial instruments, along with the duration of the instrument, may vary from period to period depending on market conditions, the relative costs of the instruments and capacity to hedge. The duration is linked to the timing of the underlying exposure, with the connection between the two being regularly monitored. The Company does not enter into derivative financial instruments for speculative or trading purposes.

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated condensed balance sheet as of September 30, 2026 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Assets/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	127,103	Other current assets	$	—	Other current liabilities	$	3,275	$	(3,275	)
Interest rate contracts	Level 2	$	100,000	Other current assets	$	905	Other current liabilities	$	—	$	905

Information related to the recurring fair value measurement of derivative instruments in the consolidated condensed balance sheet as of December 31, 2025 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Assets/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	35,122	Other current assets	$	4,521	Other current liabilities	$	—	$	4,521
Interest rate contracts	Level 2	$	100,000	Other current assets	$	—	Other current liabilities	$	775	$	(775	)


		Three Months Ended September 30,						Nine Months Ended September 30,
	Location (Income/(Loss))	2026			2025			2026			2025
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Cost of sales	$	282		$	2,086		$	6,469		$	273
	Other comprehensive (loss) income, net of tax		(2,924	)		91			(7,797	)		9,844
Total foreign currency derivatives		$	(2,642	)	$	2,177		$	(1,328	)	$	10,117

Interest rate contracts	Interest expense, net	$	(7	)	$	156		$	(32	)	$	156
	Other comprehensive (loss) income, net of tax		588			(58	)		1,680			(757	)
Total interest rate derivatives		$	581		$	98		$	1,648		$	(601	)

Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Interest expense, net	$	—		$	(104	)	$	—		$	(719	)
Total interest rate derivatives		$	—		$	(104	)	$	—		$	(719	)

The Company did not incur any hedge ineffectiveness during the three and nine months ended September 30, 2026 and 2025.

Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2026

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment

Changes in the carrying amount of goodwill, by reportable segment, for the nine months ended September 30, 2026 were as follows:


	Automotive			Medical		Total
Balance as of December 31, 2025	$	81,031		$	27,887	$	108,918
Acquisition of IME		—			15,610		15,610
Currency translation		(2,550	)		280		(2,270	)
Balance as of September 30, 2026	$	78,481		$	43,777	$	122,258

Summary of Other Intangible Assets and Accumulated Amortization Balances

Other intangible assets and accumulated amortization balances as of September 30, 2026 and December 31, 2025 were as follows:


	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	130,196	$	(82,594	)	$	(6,185	)	$	41,417
Technology		50,501		(36,793	)		(27	)		13,681
Product development costs		19,095		(18,932	)		(71	)		92
Trade names		1,600		(21	)		—			1,579
Software development		1,007		(554	)		—			453
Indefinite-lived:
Trade names		7,166		—			(530	)		6,636
Balance as of September 30, 2026	$	209,565	$	(138,894	)	$	(6,813	)	$	63,858

	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	121,316	$	(81,785	)	$	(6,185	)	$	33,346
Technology		48,478		(36,238	)		(27	)		12,213
Product development costs		19,943		(19,774	)		(71	)		98
Software development		1,007		(403	)		—			604
Indefinite-lived:
Trade names		7,065		—			(530	)		6,535
Balance as of December 31, 2025	$	197,809	$	(138,200	)	$	(6,813	)	$	52,796

- Definition

Tabular disclosure of goodwill.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Section 55
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-Topic 350
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

+ Details

Consolidated Condensed Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (2,590)	$ 14,949	$ 6,048	$ 15,298
Other comprehensive (loss) income:
Pension benefit obligations	12	15	38	43
Foreign currency translation adjustments	(125)	(687)	(8,107)	79,364
Unrealized (loss) gain on cash flow hedge derivatives, net of tax	(1,830)	25	(4,815)	7,144
Other comprehensive (loss) income, net of tax	(1,943)	(647)	(12,884)	86,551
Comprehensive (loss) income	$ (4,533)	$ 14,302	$ (6,836)	$ 101,849

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2026

Income Tax Disclosure [Abstract]

Summary of Provision for Income Taxes and Corresponding Effective Tax Rate

A summary of the provision for income taxes and the corresponding effective tax rate for the three and nine months ended September 30, 2026 and 2025, is shown below:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2026			2025			2026			2025
Income tax expense	$	13,430		$	5,935		$	19,730		$	10,204
Earnings before income tax	$	10,840		$	20,884		$	25,778		$	25,502
Effective tax rate		123.9	%		28.4	%		76.5	%		40.0	%

Total cash paid for income taxes, net of refunds	$	13,371		$	9,328		$	36,412		$	22,171

Reclassifications Out of Accumulated Other Comprehensive Loss - Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive (loss) Income into cost of sales and interest expense, net	$ 258	$ 2,222	$ 6,385	$ 2,317
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive (loss) Income into cost of sales and interest expense, net	(282)	2,086	(6,469)	2,220
Location, Statement of Income, Balance [Axis]: us-gaap:InterestIncomeExpenseNet
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive (loss) Income into cost of sales and interest expense, net	$ 7	$ 156	$ 32	$ 156

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Reclassifications Out of Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2026

Equity [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Loss

Note 13 – Reclassifications Out of Accumulated Other Comprehensive Loss

Reclassification adjustments and other activities impacting accumulated other comprehensive loss during the three and nine months ended September 30, 2026 and 2025 were as follows:


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at June 30, 2026	$	(1,695	)	$	(10,096	)	$	(114	)		$	(11,905	)
Other comprehensive loss before reclassifications		—			(125	)		(2,061	)			(2,186	)
Income tax effect of other comprehensive loss before reclassifications		—			—			447				447
Amounts reclassified from accumulated other comprehensive loss into net loss		17			—			(275	)	a		(258	)
Income taxes reclassified into net loss		(5	)		—			59				54
Net current period other comprehensive income (loss)		12			(125	)		(1,830	)			(1,943	)
Balance at September 30, 2026	$	(1,683	)	$	(10,221	)	$	(1,944	)		$	(13,848	)

(a)


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at June 30, 2025	$	(1,823	)	$	(45	)	$	3,873			$	2,005
Other comprehensive (loss) income before reclassifications		—			(687	)		2,276				1,589
Income tax effect of other comprehensive (loss) income before reclassifications		—			—			(474	)			(474	)
Amounts reclassified from accumulated other comprehensive income (loss) into net income		21			—			(2,243	)	a		(2,222	)
Income taxes reclassified into net income		(6	)		—			466				460
Net current period other comprehensive income (loss)		15			(687	)		25				(647	)
Balance at September 30, 2025	$	(1,808	)	$	(732	)	$	3,898			$	1,358

(a)


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2025	$	(1,721	)	$	(2,114	)	$	2,871			$	(964	)
Other comprehensive (loss) income before reclassifications		—			(8,107	)		320				(7,787	)
Income tax effect of other comprehensive (loss) income before reclassifications		—			—			(100	)			(100	)
Amounts reclassified from accumulated other comprehensive (loss) income into net income		52			—			(6,437	)	a		(6,385	)
Income taxes reclassified into net income		(14	)		—			1,402				1,388
Net current period other comprehensive income (loss)		38			(8,107	)		(4,815	)			(12,884	)
Balance at September 30, 2026	$	(1,683	)	$	(10,221	)	$	(1,944	)		$	(13,848	)

(a)


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)
Other comprehensive income before reclassifications		—			79,364			11,463				90,827
Income tax effect of other comprehensive income before reclassifications		—			—			(2,423	)			(2,423	)
Amounts reclassified from accumulated other comprehensive income (loss) into net income		59			—			(2,376	)	a		(2,317	)
Income taxes reclassified into net income		(16	)		—			480				464
Net current period other comprehensive income		43			79,364			7,144				86,551
Balance at September 30, 2025	$	(1,808	)	$	(732	)	$	3,898			$	1,358

(a)

The Company expects that substantially all of the existing gains and losses related to cash flow derivatives reported in accumulated other comprehensive loss as of September 30, 2026 to be reclassified into earnings during the next twelve months. See Note 10 for additional information about derivative financial instruments and the effects from reclassification to net (loss) income.