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Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 243,384 | $ 259,540 | $ 797,924 | $ 624,214
Battery Performance Solutions (BPS) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 16,928 | 15,956 | 52,265 | 33,818
Automotive Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 233,028 | 249,764 | 767,503 | 590,622
Automotive Segments | Climate Control Seat (CCS) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 89,991 | 97,058 | 297,393 | 229,465
Automotive Segments | Seat Heaters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 61,516 | 73,471 | 208,101 | 171,345
Automotive Segments | Automotive Cables |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 19,465 | 18,917 | 66,686 | 50,890
Automotive Segments | Steering Wheel Heaters |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 24,578 | 22,506 | 80,139 | 49,721
Automotive Segments | Electronics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 11,567 | 14,463 | 41,324 | 38,327
Automotive Segments | Other Automotive |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | 8,983 | 7,393 | 21,595 | 17,056
Industrial Segments | Medical Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Product revenues | $ 10,356 | $ 9,776 | $ 30,421 | $ 33,592

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