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Financial Instruments and Derivatives - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Nov. 01, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 27, 2015
Financial Instruments and Fair Value [Line Items]            
Available-for-sale securities, realized loss     $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Available-for-sale securities, realized gain     2,400,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 1,000,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 1,400,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Fair market value of investments with unrealized losses   583,076,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 583,076,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 241,760,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Fair market value of investments with unrealized losses greater than one year   2,300,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 2,300,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 900,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue    
Fair market value of investments with unrealized losses less than one year   580,800,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 580,800,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue 240,900,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue    
Goodwill, carrying value   781,058,000us-gaap_GoodwillGross 781,058,000us-gaap_GoodwillGross 770,515,000us-gaap_GoodwillGross 757,995,000us-gaap_GoodwillGross  
Goodwill, impairment loss   98,897,000us-gaap_GoodwillImpairmentLoss [1],[2],[3] 98,897,000us-gaap_GoodwillImpairmentLoss      
Gains (losses) on foreign currency transactions     (900,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (6,900,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (4,500,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized  
Realized (losses) gains on foreign currency contracts     (200,000)us-gaap_ForeignCurrencyTransactionGainLossRealized 5,900,000us-gaap_ForeignCurrencyTransactionGainLossRealized 4,000,000us-gaap_ForeignCurrencyTransactionGainLossRealized  
Proceeds from sale of equity interest 34,200,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity     34,212,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity    
Fair Value, Measurements, Nonrecurring            
Financial Instruments and Fair Value [Line Items]            
Goodwill, carrying value   372,300,000us-gaap_GoodwillGross
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 372,300,000us-gaap_GoodwillGross
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		      
Goodwill, fair value   273,438,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 273,438,000us-gaap_GoodwillFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		      
Goodwill, impairment loss   98,897,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 98,897,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		      
Subsequent Event            
Financial Instruments and Fair Value [Line Items]            
Cash proceeds from escrow account           4,800,000us-gaap_DecreaseInRestrictedCash
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Foreign Currency Forward Contracts            
Financial Instruments and Fair Value [Line Items]            
Gains (losses) on foreign currency transactions     $ (100,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 $ 200,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		    
[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.