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Schedule of Components of Deferred Tax Assets Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]    
Net operating loss carryforwards $ 10,989ter_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwards $ 14,679ter_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwards
Tax credits 50,554us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 65,210us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Pension liability 30,036us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 22,966us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Inventory valuations 29,105us-gaap_DeferredTaxAssetsInventory 38,452us-gaap_DeferredTaxAssetsInventory
Accruals 23,323us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 17,828us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Equity compensation 11,131us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 10,498us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred revenue 10,242us-gaap_DeferredTaxAssetsDeferredIncome 12,379us-gaap_DeferredTaxAssetsDeferredIncome
Vacation accrual 7,425us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences 7,291us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Other 1,725us-gaap_DeferredTaxAssetsOther 2,613us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 174,530us-gaap_DeferredTaxAssetsGross 191,916us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (41,737)us-gaap_DeferredTaxAssetsValuationAllowance (40,386)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 132,793us-gaap_DeferredTaxAssetsNet 151,530us-gaap_DeferredTaxAssetsNet
Marketable securities (1,599)us-gaap_DeferredTaxLiabilitiesInvestments (794)us-gaap_DeferredTaxLiabilitiesInvestments
Intangible assets (64,871)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (89,268)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Excess of tax over book depreciation (24,905)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (24,458)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (91,375)us-gaap_DeferredTaxLiabilities (114,520)us-gaap_DeferredTaxLiabilities
Net deferred assets $ 41,418us-gaap_DeferredTaxAssetsLiabilitiesNet $ 37,010us-gaap_DeferredTaxAssetsLiabilitiesNet