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Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Line Items]
Tax credits	$ 69,091	$ 76,083
Accruals	20,826	22,602
Pension liabilities	23,449	27,508
Inventory valuations	18,514	17,793
Deferred revenue	9,130	9,016
Equity compensation	7,190	6,861
Vacation accrual	4,772	4,747
Net operating loss carryforwards	3,658	5,440
Marketable securities	962
Other	685	713
Gross deferred tax assets	158,277	170,763
Less: valuation allowance	(69,852)	(63,919)
Total deferred tax assets	88,425	106,844
Intangible assets	(24,211)	(16,120)
Depreciation	(14,028)	(12,293)
Marketable securities		(1,125)
Total deferred tax liabilities	(38,239)	(29,538)
Net deferred assets	$ 50,186	$ 77,306

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