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Summary of Operating Loss Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Operating Loss Carryforwards [Line Items] |
U.S. Federal operating loss carryforwards | $ 11,504 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State Operating Loss Carryforwards | 8,024 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Foreign Operating Loss Carryforwards | 8,575 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
2015 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandFifteenMember
2016 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 56 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandSixteenMember
2017 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 738 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandSeventeenMember
2018 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 679 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandEighteenMember
2019 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 133 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandNineteenMember
2020-2025 |
Operating Loss Carryforwards [Line Items] |
U.S. Federal operating loss carryforwards | 10,698 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandTwentyToTwoThousandTwentyFiveMember
State Operating Loss Carryforwards | 2,686 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandTwentyToTwoThousandTwentyFiveMember
2026-2028 |
Operating Loss Carryforwards [Line Items] |
State Operating Loss Carryforwards | 676 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringTwoThousandTwentySixToTwoThousandTwentyEightMember
Beyond 2028 |
Operating Loss Carryforwards [Line Items] |
U.S. Federal operating loss carryforwards | 806 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringBeyondTwoThousandTwentyEightMember
State Operating Loss Carryforwards | 3,055 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringBeyondTwoThousandTwentyEightMember
Foreign Operating Loss Carryforwards | 115 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsExpiringBeyondTwoThousandTwentyEightMember
Non-Expiring |
Operating Loss Carryforwards [Line Items] |
Foreign Operating Loss Carryforwards | $ 8,460 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = ter_OperatingLossCarryforwardsNonExpiringMember

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