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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

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