Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Tax credits	$ 79,480	$ 69,091
Accruals	18,572	18,514
Pension liabilities	25,424	23,449
Inventory valuations	24,459	20,826
Deferred revenue	7,622	9,130
Equity compensation	7,042	7,190
Vacation accrual	4,768	4,772
Investment impairment	3,292
Net operating loss carryforwards	2,705	3,658
Marketable securities		962
Other	1,472	685
Gross deferred tax assets	174,836	158,277
Less: valuation allowance	(77,177)	(69,852)
Total deferred tax assets	97,659	88,425
Intangible assets	(18,238)	(14,028)
Depreciation	(16,705)	(24,211)
Marketable securities	(1,601)
Total deferred tax liabilities	(36,544)	(38,239)
Net deferred assets	$ 61,115	$ 50,186