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Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Product revenues $ 266,005 $ 136,061 $ 554,540 $ 364,674
Battery Performance Solutions (BPS)        
Segment Reporting Information [Line Items]        
Product revenues 17,577 6,653 35,337 17,862
Automotive Segments        
Segment Reporting Information [Line Items]        
Product revenues 255,105 124,386 534,475 340,858
Automotive Segments | Climate Control Seat (CCS)        
Segment Reporting Information [Line Items]        
Product revenues 98,229 49,879 207,402 132,407
Automotive Segments | Seat Heaters        
Segment Reporting Information [Line Items]        
Product revenues 69,864 33,342 146,585 97,874
Automotive Segments | Automotive Cables        
Segment Reporting Information [Line Items]        
Product revenues 22,940 9,833 47,221 31,973
Automotive Segments | Steering Wheel Heaters        
Segment Reporting Information [Line Items]        
Product revenues 26,697 7,980 55,561 27,215
Automotive Segments | Electronics        
Segment Reporting Information [Line Items]        
Product revenues 14,652 13,488 29,757 23,864
Automotive Segments | Other Automotive        
Segment Reporting Information [Line Items]        
Product revenues 5,146 3,211 12,612 9,663
Industrial Segments | Medical Segments        
Segment Reporting Information [Line Items]        
Product revenues $ 10,900 $ 11,675 $ 20,065 $ 23,816