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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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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