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Benefit Obligation, Amounts Recognized Company's Financial Statements and Principal Assumptions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in projected benefit obligation:      
Benefit obligation at beginning of year $ 3,419 $ 2,898  
Service cost 101 387 $ 379
Interest cost 111 98 80
Actuarial (gain) loss 78 36  
Prior service cost 509    
Benefit obligation at end of year 4,218 3,419 2,898
Gentherm GmbH      
Change in projected benefit obligation:      
Benefit obligation at beginning of year 7,326 6,980  
Interest cost 130 154 142
Paid pension distributions (272) (261)  
Actuarial (gain) loss (257) 691  
Exchange rate impact 1,000 (238)  
Prior service cost     572
Benefit obligation at end of year $ 7,927 $ 7,326 $ 6,980