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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 |  |  |  | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |
Available-for-sale securities, realized gain |  |  |  | 2,400,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 1,000,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 1,400,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Fair market value of investments with unrealized losses |  | 583,076,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue |  | 583,076,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 241,760,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue |  |
Fair market value of investments with unrealized losses greater than one year |  | 2,300,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue |  | 2,300,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 900,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue |  |
Fair market value of investments with unrealized losses less than one year |  | 580,800,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue |  | 580,800,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 240,900,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue |  |
Goodwill, carrying value |  | 781,058,000 us-gaap_GoodwillGross |  | 781,058,000 us-gaap_GoodwillGross | 770,515,000 us-gaap_GoodwillGross | 757,995,000 us-gaap_GoodwillGross |
Goodwill, impairment loss |  | 98,897,000 us-gaap_GoodwillImpairmentLoss | [1],[2],[3] | 98,897,000 us-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 | 5,900,000 us-gaap_ForeignCurrencyTransactionGainLossRealized | 4,000,000 us-gaap_ForeignCurrencyTransactionGainLossRealized |
Proceeds from sale of equity interest | 34,200,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  | 34,212,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |
Goodwill, carrying value |  | 372,300,000 us-gaap_GoodwillGross / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 372,300,000 us-gaap_GoodwillGross / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |  |
Goodwill, fair value |  | 273,438,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 273,438,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |  |
Goodwill, impairment loss |  | 98,897,000 us-gaap_GoodwillImpairmentLoss / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  | 98,897,000 us-gaap_GoodwillImpairmentLoss / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |  |
Subsequent Event |  |  |  |  |  |  |
Financial Instruments and Fair Value [Line Items] |  |  |  |  |  |  |
Cash proceeds from escrow account |  |  |  |  |  |  | 4,800,000 us-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 | $ 200,000 us-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.

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