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Retirement Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plans assets totaled | $ 345,600,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  |
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Accumulated benefit obligation for defined benefit pension plans | 357,000,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember | 286,200,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember |
Fair value of pension plans assets totaled | 316,072,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember | 256,373,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_StatementGeographicalAxis = us-gaap_DomesticCountryMember |
Foreign |  |  |
Defined Benefit Plan Disclosure |  |  |
Accumulated benefit obligation for defined benefit pension plans | 49,800,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember | 45,000,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember |
Fair value of pension plans assets totaled | 29,511,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember | 25,756,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember |
United States Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Percentage of expected return on plan assets assumption | 5.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesPlansMember |  |
Discount rate utilized to determine future pension obligations | 3.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesPlansMember | 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesPlansMember |
Fair value of pension plans assets totaled | 316,100,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesPlansMember |  |
Contribution to defined benefit pension plans | 30,000,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesPlansMember |  |
U.K. Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plans assets totaled | 28,500,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedKingdomDefinedBenefitPensionPlanMember |  |
U.K. Defined Benefit Pension Plan | Fixed Income Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Target assets allocation percentage | 80.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedKingdomDefinedBenefitPensionPlanMember |  |
U.K. Defined Benefit Pension Plan | Equity Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Target assets allocation percentage | 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedKingdomDefinedBenefitPensionPlanMember |  |
Other Foreign Defined Benefit Pension Plans |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of pension plans assets totaled | 1,000,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedContributionPlanTypeAxis = ter_OtherForeignMember |  |
U.S. Supplemental Executive Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Contribution to defined benefit pension plans | 1,800,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesSupplementalExecutiveDefinedBenefitPensionPlanMember | 1,700,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = ter_UnitedStatesSupplementalExecutiveDefinedBenefitPensionPlanMember |
Foreign Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure |  |  |
Contribution to defined benefit pension plans | 1,200,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | 2,500,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember |
Net Periodic Benefit Cost |  |  |
Defined Benefit Plan Disclosure |  |  |
Accumulated other comprehensive income (loss), prior service cost expected to be recognized | 100,000 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ter_NetPeriodicBenefitCostMember |  |
Postretirement Benefit Costs | Scenario, Forecast |  |  |
Defined Benefit Plan Disclosure |  |  |
Accumulated other comprehensive income (loss), prior service cost expected to be recognized |  |  | $ (600,000)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PostretirementBenefitCostsMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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 (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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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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