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Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Line Items] |  |
Tax credits | $ 87,595 | $ 79,480
Accruals | 33,156 | 25,424
Pension liabilities | 28,348 | 24,459
Inventory valuations | 18,427 | 18,572
Lease liability | 12,627 | 13,093
Deferred revenue | 9,235 | 7,622
Equity compensation | 6,543 | 7,042
Vacation accrual | 5,890 | 4,768
Investment impairment | 3,292 | 3,292
Net operating loss carryforwards | 1,823 | 2,705
Other | 626 | 187
Gross deferred tax assets | 207,562 | 186,644
Less: valuation allowance | (84,962) | (77,177)
Total deferred tax assets | 122,600 | 109,467
Depreciation | (14,525) | (18,238)
Intangible assets | (12,726) | (16,705)
Right of use assets | (10,688) | (11,197)
Contingent consideration | (3,515) |
Marketable securities | (3,344) | (1,601)
Other | (710) | (611)
Total deferred tax liabilities | (45,508) | (48,352)
Net deferred assets | $ 77,092 | $ 61,115

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