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Pretax Amounts Recognized in Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Actuarial Losses/(gains)	$ 78	$ 36	$ (35)
Amortization of actuarial losses			(27)
Establish prior service cost	509
Amortization prior service cost	(509)
Pretax amounts recognized in other comprehensive (loss) income	78	36	(62)
Gentherm GmbH
Defined Benefit Plan Disclosure [Line Items]
Actuarial Losses/(gains)	(229)	718	(154)
Amortization of actuarial losses	(78)	(48)	(59)
Amortization prior service cost			(572)
Pretax amounts recognized in other comprehensive (loss) income	$ (307)	$ 670	$ (785)

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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