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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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