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Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Product revenues | $ 261,889 | $ 249,267
Depreciation and amortization | 12,892 | 10,192
Operating income (loss) | 20,671 | 34,849
Operating Segments | Automotive Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 240,019 | 221,833
Depreciation and amortization | 10,809 | 8,131
Operating income (loss) | 41,282 | 50,757
Operating Segments | Industrial Segments |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 21,870 | 27,434
Depreciation and amortization | 1,351 | 1,418
Operating income (loss) | (6,776) | (2,486)
Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 732 | 643
Operating income (loss) | $ (13,835) | $ (13,422)

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