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Schedule of Components of Deferred Tax Assets Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Line Items]    
Tax credits $ 44,684 $ 50,554
Pension liabilities 31,742 30,036
Inventory valuations 29,445 29,105
Accruals 26,563 23,323
Deferred revenue 10,232 10,242
Equity compensation 9,674 11,131
Net operating loss carryforwards 7,989 10,989
Vacation accrual 7,354 7,425
Other 502 1,725
Gross deferred tax assets 168,185 174,530
Less: valuation allowance (43,039) (41,737)
Total deferred tax assets 125,146 132,793
Intangible assets (68,433) (64,871)
Depreciation (20,541) (24,905)
Marketable securities (458) (1,599)
Total deferred tax liabilities (89,432) (91,375)
Net deferred assets $ 35,714 $ 41,418