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Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Product revenues	$ 243,326	$ 266,400	$ 501,247	$ 530,986
Depreciation and amortization	11,165	12,931	22,217	25,823
Operating income	20,057	15,593	41,902	36,242
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues	$ 13,626	23,250	29,190	45,415
Industrial Segments | CSZ-IC
Segment Reporting Information [Line Items]
Product revenues		10,418	3,418	20,631
Depreciation and amortization		635	0	1,260
Operating income		$ 237	$ 198	$ 837

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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