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Schedule of Revenues by Country (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
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers $ 323,236us-gaap_Revenues [1],[2],[3] $ 478,010us-gaap_Revenues [1],[4] $ 525,567us-gaap_Revenues [1] $ 321,010us-gaap_Revenues $ 285,301us-gaap_Revenues [5],[6] $ 433,376us-gaap_Revenues $ 428,889us-gaap_Revenues $ 280,367us-gaap_Revenues $ 1,647,824us-gaap_Revenues [7] $ 1,427,933us-gaap_Revenues [7] $ 1,656,750us-gaap_Revenues [7]
TAIWAN, PROVINCE OF CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 495,942us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TW		 [7] 265,472us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TW		 [7] 299,359us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TW		 [7]
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 292,145us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CN		 [7] 323,564us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CN		 [7] 351,335us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CN		 [7]
UNITED STATES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 213,104us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 [7] 230,178us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 [7] 238,280us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 [7]
KOREA, REPUBLIC OF                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 145,608us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_KR		 [7] 119,286us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_KR		 [7] 216,445us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_KR		 [7]
SINGAPORE                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 119,421us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_SG		 [7] 114,765us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_SG		 [7] 101,502us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_SG		 [7]
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 111,043us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [7] 90,797us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [7] 77,099us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 [7]
MALAYSIA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 83,910us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MY		 [7] 86,900us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MY		 [7] 69,064us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MY		 [7]
PHILIPPINES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 68,662us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_PH		 [7] 63,392us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_PH		 [7] 111,571us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_PH		 [7]
JAPAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 63,761us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP		 [7] 81,806us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP		 [7] 100,807us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_JP		 [7]
THAILAND                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 44,117us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TH		 [7] 32,209us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TH		 [7] 80,518us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_TH		 [7]
Rest Of The World                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers                 $ 10,111us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ter_RestOfWorldMember		 [7] $ 19,564us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ter_RestOfWorldMember		 [7] $ 10,770us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= ter_RestOfWorldMember		 [7]
[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.
[7] Revenues attributable to a country are based on location of customer site.