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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 25, 2013 | Oct. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 98,897 us-gaap_GoodwillImpairmentLoss | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | $ 98,897 us-gaap_GoodwillImpairmentLoss |  |  |  |
Acquired intangible assets amortization | 15,957 us-gaap_AmortizationOfIntangibleAssets | [1],[2],[3] | 18,271 us-gaap_AmortizationOfIntangibleAssets | [1],[4] | 18,271 us-gaap_AmortizationOfIntangibleAssets | [1] | 18,271 us-gaap_AmortizationOfIntangibleAssets | 18,284 us-gaap_AmortizationOfIntangibleAssets | [5],[6] | 18,064 us-gaap_AmortizationOfIntangibleAssets | 18,063 us-gaap_AmortizationOfIntangibleAssets | 18,036 us-gaap_AmortizationOfIntangibleAssets | 70,771 us-gaap_AmortizationOfIntangibleAssets | 72,447 us-gaap_AmortizationOfIntangibleAssets | 73,508 us-gaap_AmortizationOfIntangibleAssets |  |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 4,900 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |  |  |  |  |  | 4,900 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |  | 4,870 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_ZtecCorporationMember |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 9,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  |  |  |  |  |  |  |  |  |  |  | $ 9,100 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember |  |  |  | $ 9,080 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ter_AvionicsInterfaceTechnologiesLlcMember
[1] | Dividends declared by Teradyne's Board of Directors were paid in each of the second, third and fourth quarters of 2014.
[2] | In the fourth quarter ended December 31, 2014, Teradyne recorded pension and post retirement net actuarial losses of $46.6 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] | In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[4] | Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] | Other (income) expense, net includes a $34.2 million gain from the sale of an equity investment.
[6] | In the fourth quarter ended December 31, 2013, Teradyne recorded pension and post retirement net actuarial gains of $9.0 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.

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