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)