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Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [1] | Sep. 30, 2018 | [1] | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues | $ 230,381 | $ 240,056 | $ 243,326 | $ 257,921 | $ 256,015 | $ 261,504 | $ 266,400 | $ 264,586 | $ 971,684 | $ 1,048,505 | $ 993,991
Automotive Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 920,225 | 957,824 | 886,600
Automotive Segments | Climate Control Seat (CCS) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 359,355 | 373,945 | 387,961
Automotive Segments | Seat Heaters |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 284,174 | 305,337 | 307,308
Automotive Segments | Automotive Cables |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 88,031 | 98,931 | 92,092
Automotive Segments | Steering Wheel Heaters |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 65,426 | 69,845 | 62,125
Automotive Segments | Electronics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 47,542 | 56,783 | 8,816
Automotive Segments | Battery Thermal Management (BTM) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 41,498 | 28,472 | 10,046
Automotive Segments | Other Automotive |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 34,199 | 24,511 | 18,252
Industrial Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 51,459 | 90,681 | 107,391
Industrial Segments | Medical |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 36,860 | 30,108 | 30,375
Industrial Segments | GPT |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | 11,181 | 19,520 | 32,282
Industrial Segments | CSZ-IC |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues |  |  |  |  |  |  |  |  | $ 3,418 | $ 41,053 | $ 44,734
[1] | Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses. See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

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