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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Feb. 13, 2025
Jun. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
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    
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   30,788,989  
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    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock, no par value    
Document Transition Report false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Public Float     $ 1,519,329,529
Document Annual Report true    
Auditor Firm Id 42    
Auditor Name ERNST & YOUNG LLP    
Auditor Location Detroit, Michigan    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the proxy statement for the 2025 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report to the extent described herein.

    
Document Financial Statement Error Correction [Flag] false    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Gentherm Incorporated (the Company) as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, changes in shareholders' equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule listed in the Index at Item 15 (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 19, 2025, expressed an unqualified opinion thereon.

Opinion on Internal Control Over Financial Reporting

We have audited Gentherm Incorporated’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Gentherm Incorporated (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, changes in shareholders' equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and financial statement schedule listed in the Index at Item 15 and our report dated February 19, 2025 expressed an unqualified opinion thereon.