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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended
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Oct. 31, 2014 | Oct. 25, 2013 | Dec. 31, 2014
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Discount rate | 4.70%us-gaap_FairValueInputsDiscountRate | 5.20%us-gaap_FairValueInputsDiscountRate |
Significant Unobservable Inputs (Level 3) | Income Approach Valuation Technique |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent consideration |  |  | 1,600 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember
Revenue Earnout |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Target achievement, probability |  |  | 0.00%ter_FairValueInputsProbabilityOfAchievingTarget / us-gaap_ContingentConsiderationByTypeAxis = ter_RevenueEarnoutMember
Customer Orders |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Target achievement, probability |  |  | 40.00%ter_FairValueInputsProbabilityOfAchievingTarget / us-gaap_ContingentConsiderationByTypeAxis = ter_CustomerOrdersMember
Discount rate |  |  | 5.20%us-gaap_FairValueInputsDiscountRate / us-gaap_ContingentConsiderationByTypeAxis = ter_CustomerOrdersMember

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- Definition Fair Value Inputs, Probability of Achieving Target + References No definition available. + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Details
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