Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 95,393	$ 70,119	$ 35,133
Other comprehensive income (loss), gross of tax:
Net gain (loss) on pension benefit obligations	847	(2,295)	126
Foreign currency translation adjustments	(25,904)	(25,044)	5,315
Unrealized gain (loss) on foreign currency derivative securities	10	(10)
Unrealized gain on interest rate derivative securities		81	143
Unrealized loss on commodity derivative securities	(725)
Other comprehensive (loss) income, gross of tax	(25,772)	(27,268)	5,584
Other comprehensive income, related tax effects:
Net gain (loss) on pension benefit obligations	(234)	680	18
Foreign currency translation adjustments	(417)	6,048	426
Unrealized loss on commodity derivative securities	496
Other comprehensive (loss) income, related tax effect	(155)	6,728	444
Other comprehensive (loss) income, net of tax:	(25,927)	(20,540)	6,028
Comprehensive income:	69,466	49,579	41,161
Less: comprehensive loss attributable to the non-controlling interest			(271)
Comprehensive income attributable to Gentherm Incorporated:	$ 69,466	$ 49,579	$ 41,432