Financial Instruments and Derivatives - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |||
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Apr. 05, 2015
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Mar. 30, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Oct. 31, 2014
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Financial Instruments and Fair Value [Line Items] | |||||
Available-for-sale securities, realized loss | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | |||
Available-for-sale securities, realized gain | 500,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 300,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | |||
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 319,060,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 583,076,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | |||
Fair market value of investments with unrealized losses greater than one year | 300,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 2,300,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | |||
Fair market value of investments with unrealized losses less than one year | 318,800,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 580,800,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | |||
Gains (losses) on foreign currency transactions | 4,300,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 600,000us-gaap_ForeignCurrencyTransactionGainLossUnrealized | |||
Realized (losses) gains on foreign currency contracts | (3,400,000)us-gaap_ForeignCurrencyTransactionGainLossRealized | (700,000)us-gaap_ForeignCurrencyTransactionGainLossRealized | |||
Offsetting foreign exchange contracts | 0us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet | 0us-gaap_DerivativeFairValueAmountOffsetAgainstCollateralNet | |||
ZTEC Instruments, Inc. | Maximum | |||||
Financial Instruments and Fair Value [Line Items] | |||||
Contingent consideration | 5,000,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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AIT | Maximum | |||||
Financial Instruments and Fair Value [Line Items] | |||||
Contingent consideration | 2,100,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = ter_AITMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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Foreign Currency Forward Contracts | |||||
Financial Instruments and Fair Value [Line Items] | |||||
Notional amount of foreign currency forward contracts | 96,200,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
73,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
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Gains (losses) on foreign currency transactions | $ 0us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
$ (100,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
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- Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of liability recognized arising from contingent consideration in a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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