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Schedule of Components of Deferred Tax Assets Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Income Tax Disclosure [Line Items] |  |
Net operating loss carryforwards | $ 36,674 | $ 37,899
Tax credits | 64,123 | 76,248
Inventory valuations | 50,886 | 42,760
Pension liability | 28,674 | 21,119
Research and development | 284 | 10,028
Accruals | 14,246 | 13,817
Equity compensation | 9,355 | 8,729
Vacation accrual | 6,452 | 6,267
Other | 282 | 398
Deferred revenue | 15,118 | 35,869
Gross deferred tax assets | 226,094 | 253,134
Less: valuation allowance | (55,446) | (51,066)
Total deferred tax assets | 170,648 | 202,068
Marketable securities | (996) | (827)
Intangible assets | (114,730) | (144,925)
Excess of tax over book depreciation | (22,446) | (18,417)
Total deferred tax liabilities | (138,172) | (164,169)
Net deferred assets | $ 32,476 | $ 37,899

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