Segment Reporting - Segment Information About Reported Product Revenues and Operating Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Product revenues	$ 913,098	$ 971,684	$ 1,048,505
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization	$ 41,114	$ 44,246	$ 50,638
Operating income (loss)	89,217	84,260	72,788
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues	$ 869,998	$ 920,225	$ 957,824
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization	$ 37,662	$ 40,923	$ 44,246
Operating income (loss)	138,410	141,206	136,421
Medical Segments
Segment Reporting Information [Line Items]
Product revenues	$ 43,100	$ 51,459	$ 90,681
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization	$ 2,366	$ 1,621	$ 3,759
Operating income (loss)	$ 971	$ (5,735)	$ (6,900)
Corporate Segments
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization	$ 1,086	$ 1,702	$ 2,633
Operating income (loss)	$ (50,164)	$ (51,211)	$ (56,733)