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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 31, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]                        
Income tax expense (benefit) from operations, total $ (21,002,000)us-gaap_IncomeTaxExpenseBenefit [1],[2],[3] $ 17,721,000us-gaap_IncomeTaxExpenseBenefit [1],[4] $ 20,187,000us-gaap_IncomeTaxExpenseBenefit [1] $ (2,802,000)us-gaap_IncomeTaxExpenseBenefit $ 13,096,000us-gaap_IncomeTaxExpenseBenefit [5],[6] $ 18,093,000us-gaap_IncomeTaxExpenseBenefit $ 13,801,000us-gaap_IncomeTaxExpenseBenefit $ (8,015,000)us-gaap_IncomeTaxExpenseBenefit $ 14,104,000us-gaap_IncomeTaxExpenseBenefit $ 36,975,000us-gaap_IncomeTaxExpenseBenefit $ 48,927,000us-gaap_IncomeTaxExpenseBenefit  
U.S. research and development tax credit reduction Percentage                 (7.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch    
U.S. statutory federal tax rate                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Tax savings due to the tax holiday                 13,200,000us-gaap_IncomeTaxReconciliationTaxHolidays 4,700,000us-gaap_IncomeTaxReconciliationTaxHolidays 10,900,000us-gaap_IncomeTaxReconciliationTaxHolidays  
Tax savings due to the tax holiday, per share                 $ 0.06us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.02us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.05us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare  
Tax holiday expiration date                 December 31, 2015      
Accrued interest and penalties 600,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued       400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued       600,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Interest and penalties related to income tax                 200,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 200,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 100,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense  
Valuation allowance amount decrease/increase                 1,300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (19,500,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Valuation allowance includes net deferred tax assets 41,737,000us-gaap_DeferredTaxAssetsValuationAllowance       40,386,000us-gaap_DeferredTaxAssetsValuationAllowance       41,737,000us-gaap_DeferredTaxAssetsValuationAllowance 40,386,000us-gaap_DeferredTaxAssetsValuationAllowance    
U.S. Federal operating loss carryforwards 11,504,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic               11,504,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic      
Net operating loss carryforward excess tax deductions related to stock based compensation 0ter_NetOperatingLossCarryforwardExcessTaxDeductionRelatedToStockBasedCompensation               0ter_NetOperatingLossCarryforwardExcessTaxDeductionRelatedToStockBasedCompensation      
Tax credit carry forwards, approximately 140,800,000us-gaap_TaxCreditCarryforwardAmount               140,800,000us-gaap_TaxCreditCarryforwardAmount      
Tax credits carry forwards 50,554,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards       65,210,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards       50,554,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 65,210,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards    
Alternative minimum tax credits carry forwards 6,600,000ter_DeferredTaxAssetsAlternativeMinimumTaxCreditsCarryforwards               6,600,000ter_DeferredTaxAssetsAlternativeMinimumTaxCreditsCarryforwards      
Unrecognized tax benefits 30,418,000us-gaap_UnrecognizedTaxBenefits       21,203,000us-gaap_UnrecognizedTaxBenefits       30,418,000us-gaap_UnrecognizedTaxBenefits 21,203,000us-gaap_UnrecognizedTaxBenefits 18,666,000us-gaap_UnrecognizedTaxBenefits 19,391,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits, if recognized would impact effective tax rate 24,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate               24,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Unrecognized tax benefits, if recognized would impact valuation allowance 6,300,000ter_UnrecognizedTaxBenefitsIfRecognizedWouldImpactValuationAllowance               6,300,000ter_UnrecognizedTaxBenefitsIfRecognizedWouldImpactValuationAllowance      
Decrease in unrecognized tax benefits                 800,000ter_IncreaseDecreaseInUnrecognizedTaxBenefit      
Deferred tax liability not been established 556,900,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries               556,900,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
General Business Tax Credit Carryforward                        
Income Taxes [Line Items]                        
Tax credits carry forwards 37,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		               37,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember		      
Foreign                        
Income Taxes [Line Items]                        
Tax credits carry forwards 27,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ForeignCountryMember		               27,500,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ForeignCountryMember		      
State and Local Jurisdiction                        
Income Taxes [Line Items]                        
Tax credits carry forwards 69,700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_StateAndLocalJurisdictionMember		               69,700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Stock Option                        
Income Taxes [Line Items]                        
Tax credits carry forwards 46,600,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_StockOptionMember		               46,600,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_StockOptionMember		      
GenRad, Inc.                        
Income Taxes [Line Items]                        
U.S. Federal operating loss carryforwards 10,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_BusinessAcquisitionAxis
= ter_GenradIncMember		               10,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_BusinessAcquisitionAxis
= ter_GenradIncMember		      
ZTEC Instruments, Inc.                        
Income Taxes [Line Items]                        
U.S. Federal operating loss carryforwards $ 800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		               $ 800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		      
Minimum                        
Income Taxes [Line Items]                        
Tax credit carry forward, expiration date                 2017      
Minimum | Foreign                        
Income Taxes [Line Items]                        
Tax credit carry forward, expiration date                 2018      
Maximum                        
Income Taxes [Line Items]                        
Tax credit carry forward, expiration date                 2034      
Maximum | Foreign                        
Income Taxes [Line Items]                        
Tax credit carry forward, expiration date                 2022      
[1] Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.