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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 $ 98,897us-gaap_GoodwillImpairmentLoss [1],[2],[3]               $ 98,897us-gaap_GoodwillImpairmentLoss        
Acquired intangible assets amortization 15,957us-gaap_AmortizationOfIntangibleAssets [1],[2],[3] 18,271us-gaap_AmortizationOfIntangibleAssets [1],[4] 18,271us-gaap_AmortizationOfIntangibleAssets [1] 18,271us-gaap_AmortizationOfIntangibleAssets 18,284us-gaap_AmortizationOfIntangibleAssets [5],[6] 18,064us-gaap_AmortizationOfIntangibleAssets 18,063us-gaap_AmortizationOfIntangibleAssets 18,036us-gaap_AmortizationOfIntangibleAssets 70,771us-gaap_AmortizationOfIntangibleAssets 72,447us-gaap_AmortizationOfIntangibleAssets 73,508us-gaap_AmortizationOfIntangibleAssets    
ZTEC Instruments, Inc.                          
Goodwill and Intangible Assets Disclosure [Line Items]                          
Intangible assets         4,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		         4,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		   4,870us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_ZtecCorporationMember		  
Avionics Interface Technologies, LLC                          
Goodwill and Intangible Assets Disclosure [Line Items]                          
Intangible assets $ 9,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		               $ 9,100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ter_AvionicsInterfaceTechnologiesLlcMember		       $ 9,080us-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.