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Schedule of Target Assets Allocation (Detail) | 12 Months Ended
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Dec. 31, 2014
Passive And Active Fixed Income | Barclays U.S. Long Government/Credit Bond Index | Fixed Income Funds |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 85.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / ter_DefinedBenefitPlanAssetAllocationsAxis = ter_PassiveAndActiveFixedIncomeMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = ter_BarclaysCapitalLongGovernmentCreditIndexMember
Equity (Large Cap) | S&P 500 Stock Index | Equity Securities |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / ter_DefinedBenefitPlanAssetAllocationsAxis = ter_EquityLargeCapMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = ter_StandardAndPoorFiveHundredStockIndexMember
International Equity | MSCI EAFE Index | Equity Securities |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / ter_DefinedBenefitPlanAssetAllocationsAxis = ter_InternationalEquityMember / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = ter_MsciEafeIndexNetDividendsMember

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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