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Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 240,056 | $ 261,504 | $ 741,303 | $ 792,490
Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 228,243 | 238,849 | 700,300 | 724,420
Automotive Segments | Climate Control Seat (CCS) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 88,133 | 97,578 | 270,924 | 276,191
Automotive Segments | Seat Heaters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 71,030 | 70,768 | 218,578 | 235,164
Automotive Segments | Steering Wheel Heaters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 16,621 | 18,095 | 49,620 | 53,192
Automotive Segments | Automotive Cables |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 20,361 | 24,961 | 66,316 | 77,471
Automotive Segments | Battery Thermal Management (BTM) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 11,890 | 7,461 | 31,531 | 18,863
Automotive Segments | Electronics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 11,729 | 12,590 | 36,035 | 44,409
Automotive Segments | Other Automotive |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 8,479 | 7,396 | 27,296 | 19,130
Industrial Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 11,813 | 22,655 | 41,003 | 68,070
Industrial Segments | Remote Power Generation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 3,477 | 4,378 | 11,181 | 14,310
Industrial Segments | Industrial Chambers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues |  | 9,829 | 3,418 | 30,460
Industrial Segments | Gentherm Medical |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 8,336 | $ 8,448 | $ 26,404 | $ 23,300

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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