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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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