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

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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