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Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Product revenues	$ 243,326	$ 266,400	$ 501,247	$ 530,986
Percentage change	(8.70%)		(5.60%)
Battery Thermal Management (BTM)
Segment Reporting Information [Line Items]
Product revenues			$ 19,641	11,402
Percentage change			72.30%
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	$ 229,700	243,150	$ 472,057	485,571
Percentage change	(5.50%)		(2.80%)
Automotive Segments | Climate Control Seat (CCS)
Segment Reporting Information [Line Items]
Product revenues	$ 88,437	90,395	$ 182,791	178,613
Percentage change	(2.10%)		2.30%
Automotive Segments | Seat Heaters
Segment Reporting Information [Line Items]
Product revenues	$ 73,628	80,176	$ 147,548	164,396
Percentage change	(8.20%)		(10.20%)
Automotive Segments | Steering Wheel Heaters
Segment Reporting Information [Line Items]
Product revenues	$ 16,029	17,540	$ 32,999	35,097
Percentage change	(8.60%)		(6.00%)
Automotive Segments | Automotive Cables
Segment Reporting Information [Line Items]
Product revenues	$ 22,205	25,645	$ 45,955	52,510
Percentage change	(13.40%)		(12.50%)
Automotive Segments | Battery Thermal Management (BTM)
Segment Reporting Information [Line Items]
Product revenues	$ 8,897	7,241
Percentage change	22.90%
Automotive Segments | Electronics
Segment Reporting Information [Line Items]
Product revenues	$ 11,454	15,842	$ 24,306	31,819
Percentage change	(27.60%)		(23.60%)
Automotive Segments | Other Automotive
Segment Reporting Information [Line Items]
Product revenues	$ 9,050	6,311	$ 18,817	11,734
Percentage change	43.40%		60.40%
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	$ 13,626	23,250	$ 29,190	45,415
Percentage change	(41.40%)		(35.70%)
Industrial Segments | Remote Power Generation
Segment Reporting Information [Line Items]
Product revenues	$ 3,745	5,270	$ 7,704	9,932
Percentage change	(28.90%)		(22.40%)
Industrial Segments | Industrial Chambers
Segment Reporting Information [Line Items]
Product revenues		10,418	$ 3,418	20,631
Percentage change	(100.00%)		(83.40%)
Industrial Segments | Gentherm Medical
Segment Reporting Information [Line Items]
Product revenues	$ 9,881	$ 7,562	$ 18,068	$ 14,852
Percentage change	30.70%		21.70%

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