Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Product revenues	$ 232,625	$ 223,818	$ 681,059	$ 644,168
Depreciation and amortization	10,177	7,800	27,724	23,123
Operating income (loss)	27,415	37,449	79,653	91,196
Operating Segments | Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	212,566	202,734	634,642	603,131
Depreciation and amortization	8,631	6,956	23,566	20,157
Operating income (loss)	54,408	42,123	133,271	124,875
Operating Segments | Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	20,059	21,084	46,417	41,037
Depreciation and amortization	989	450	2,578	1,343
Operating income (loss)	(4,899)	3,871	(14,628)	959
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	557	394	1,580	1,623
Operating income (loss)	$ (22,094)	$ (8,545)	$ (38,990)	$ (34,638)