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Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Product revenues | $ 288,535 | $ 228,613
Automotive Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 279,370 | 216,472
Automotive Segments | Climate Control Seat (CCS) |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 109,173 | 82,528
Automotive Segments | Seat Heaters |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 76,721 | 64,532
Automotive Segments | Automotive Cables |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 24,281 | 22,140
Automotive Segments | Steering Wheel Heaters |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 28,864 | 19,235
Automotive Segments | Battery Performance Solutions (BPS) |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 17,760 | 11,209
Automotive Segments | Electronics |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 15,105 | 10,376
Automotive Segments | Other Automotive |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 7,466 | 6,452
Industrial Segments | Medical Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | $ 9,165 | $ 12,141

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