Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 263,779	$ 243,378	$ 525,668	$ 492,645
Depreciation and amortization	12,931	10,999	25,823	21,191
Restructuring expenses	6,215		7,080
Operating income (loss)	15,593	25,136	36,242	59,976
Automotive Segments
Segment Reporting Information [Line Items]
Restructuring expenses			3,247
Industrial Segments
Segment Reporting Information [Line Items]
Restructuring expenses			3,833
Operating Segments | Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	240,823	215,812	480,842	437,645
Depreciation and amortization	10,970	9,048	21,779	17,179
Restructuring expenses	2,529		3,247
Operating income (loss)	37,240	40,066	78,404	90,743
Operating Segments | Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	22,956	27,566	44,826	55,000
Depreciation and amortization	1,301	1,288	2,652	2,706
Restructuring expenses	3,686		3,833
Operating income (loss)	(7,881)	(2,719)	(14,561)	(5,134)
Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	660	663	1,392	1,306
Operating income (loss)	$ (13,766)	$ (12,211)	$ (27,601)	$ (25,633)