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Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Line Items]    
Tax credits $ 76,083 $ 57,313
Accruals 27,508 27,247
Pension liabilities 22,602 31,581
Inventory valuations 17,793 31,227
Deferred revenue 9,016 12,806
Equity compensation 6,861 9,922
Net operating loss carryforwards 5,440 5,244
Vacation accrual 4,747 7,874
Other 713 630
Gross deferred tax assets 170,763 183,844
Less: valuation allowance (63,919) (48,369)
Total deferred tax assets 106,844 135,475
Intangible assets (16,120) (22,887)
Depreciation (12,293) (17,117)
Marketable securities (1,125) (210)
Total deferred tax liabilities (29,538) (40,214)
Net deferred assets $ 77,306 $ 95,261