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Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]    
Tax credits $ 57,313 $ 44,684
Pension liabilities 31,581 31,742
Inventory valuations 31,227 29,445
Accruals 27,247 26,563
Deferred revenue 12,806 10,232
Equity compensation 9,922 9,674
Vacation accrual 7,874 7,354
Net operating loss carryforwards 5,244 7,989
Other 630 502
Gross deferred tax assets 183,844 168,185
Less: valuation allowance (48,369) (43,039)
Total deferred tax assets 135,475 125,146
Intangible assets (22,887) (68,433)
Depreciation (17,117) (20,541)
Marketable securities (210) (458)
Total deferred tax liabilities (40,214) (89,432)
Net deferred assets $ 95,261 $ 35,714