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Schedule of Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,000,625 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 855,786 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale marketable securities, Unrealized Gain | 4,818 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 3,689 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available-for-sale marketable securities, Unrealized (Loss) | (867)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (1,515)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Available-for-sale marketable securities, Fair Market Value | 1,004,576 us-gaap_AvailableForSaleSecurities | 857,960 us-gaap_AvailableForSaleSecurities
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 583,076 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 241,760 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 402,197 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember | 468,084 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale marketable securities, Unrealized Gain | 362 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember | 94 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss) | (405)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember | (283)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale marketable securities, Fair Market Value | 402,154 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember | 467,895 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 317,771 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember | 108,212 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USTreasurySecuritiesMember
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 258,452 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 202,573 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain | 135 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 75 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss) | (85)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | (60)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Available-for-sale marketable securities, Fair Market Value | 258,502 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 202,588 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 104,642 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember | 84,498 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 140,616 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember | 105,583 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember
Available-for-sale marketable securities, Unrealized Gain | 26 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember | 16 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember
Available-for-sale marketable securities, Unrealized (Loss) | (4)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember | (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember
Available-for-sale marketable securities, Fair Market Value | 140,638 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember | 105,598 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 41,747 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember | 7,993 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CommercialPaperMember
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 139,374 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 65,747 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale marketable securities, Unrealized Gain | 2,414 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 762 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale marketable securities, Unrealized (Loss) | (321)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | (1,122)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale marketable securities, Fair Market Value | 141,467 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 65,387 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 96,998 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember | 40,355 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CorporateDebtSecuritiesMember
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 10,492 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember | 10,463 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember
Available-for-sale marketable securities, Unrealized Gain | 1,870 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember | 2,742 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember
Available-for-sale marketable securities, Unrealized (Loss) | (29)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember | (49)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember
Available-for-sale marketable securities, Fair Market Value | 12,333 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember | 13,156 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 1,234 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember | 702 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ter_EquityAndDebtMutualFundsMember
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 49,048 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember | 3,258 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember
Available-for-sale marketable securities, Unrealized Gain | 11 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember |
Available-for-sale marketable securities, Unrealized (Loss) | (23)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember |
Available-for-sale marketable securities, Fair Market Value | 49,036 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember | 3,258 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 20,684 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CertificatesOfDepositMember |
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 446 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 78 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Available-for-sale marketable securities, Fair Market Value | $ 446 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | $ 78 us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_ForeignCorporateDebtSecuritiesMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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