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Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Product revenues | $ 257,921 | $ 264,586
Percentage change | (2.50%) |
Automotive Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 242,357 | 242,421
Automotive Segments | Climate Control Seat (CCS) |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 94,354 | 88,218
Percentage change | 7.00% |
Automotive Segments | Seat Heaters |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 73,920 | 84,220
Percentage change | (12.20%) |
Automotive Segments | Steering Wheel Heaters |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 16,970 | 17,557
Percentage change | (3.30%) |
Automotive Segments | Automotive Cables |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 23,749 | 26,865
Percentage change | (11.60%) |
Automotive Segments | Battery Thermal Management (BTM) |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 10,745 | 4,161
Percentage change | 158.20% |
Automotive Segments | Electronics |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 12,852 | 15,188
Percentage change | (15.40%) |
Automotive Segments | Other Automotive |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 9,767 | 6,212
Percentage change | 57.20% |
Industrial Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 15,564 | 22,165
Percentage change | (29.80%) |
Industrial Segments | Remote Power Generation |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 3,959 | 4,662
Percentage change | (15.10%) |
Industrial Segments | Industrial Chambers |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 3,418 | 10,213
Percentage change | (66.50%) |
Industrial Segments | Gentherm Medical |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 8,187 | $ 7,290
Percentage change | 12.30% |

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