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Schedule of Reported Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 05, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	$ 1,045,974us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 1,000,625us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale marketable securities, Unrealized Gain	6,297us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	4,818us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available-for-sale marketable securities, Unrealized (Loss)	(330)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(867)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale marketable securities, Fair Market Value	1,051,941us-gaap_AvailableForSaleSecurities	1,004,576us-gaap_AvailableForSaleSecurities
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	319,060us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	583,076us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	649,066us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember	533,833us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain	224us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember	99us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss)	(71)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember	(145)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value	649,219us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember	533,787us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	223,414us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember	240,234us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_MarketableSecuritiesMember
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	396,908us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember	466,792us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain	6,073us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember	4,719us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss)	(259)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember	(722)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value	402,722us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember	470,789us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 95,646us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember	$ 342,842us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_LongTermMarketableSecuritiesMember

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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