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v2.4.1.9

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

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