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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Feb. 17, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
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   33,208,973  
Entity Shell Company false    
Entity File Number 0-21810    
Entity Tax Identification Number 95-4318554    
Entity Address, Address Line One 21680 Haggerty Road    
Entity Address, City or Town Northville    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 48167    
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     $ 2,049,990,444
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 2023 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report to the extent described herein.