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Schedule of Revenues by Country (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
 [1],[2]
Oct. 04, 2015
 [3]
Jul. 05, 2015
 [4]
Apr. 05, 2015
Dec. 31, 2014
 [5],[6],[7]
Sep. 28, 2014
 [5],[8]
Jun. 29, 2014
 [5]
Mar. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers $ 318,444 $ 465,994 $ 512,739 $ 342,401 $ 323,236 $ 478,010 $ 525,567 $ 321,010 $ 1,639,578 [9] $ 1,647,824 [9] $ 1,427,933 [9]
TAIWAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 436,389 495,942 265,472
CHINA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 264,898 292,145 323,564
UNITED STATES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 217,386 213,104 230,178
JAPAN                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 128,228 63,761 81,806
KOREA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 120,224 145,608 119,286
Europe                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 111,903 111,043 90,797
SINGAPORE                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 105,216 119,421 114,765
PHILIPPINES                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 96,103 68,662 63,392
MALAYSIA                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 76,707 83,910 86,900
THAILAND                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 59,104 44,117 32,209
Rest Of The World                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue from unaffiliated customers [9]                 $ 23,420 $ 10,111 $ 19,564
[1] In the fourth quarter ended December 31, 2015, Teradyne recorded pension and post retirement net actuarial losses of $17.7 million. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[2] Restructuring and other includes a $5.3 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and a $(0.3) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[3] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[4] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[5] Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[6] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[7] 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.
[8] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[9] Revenues attributable to a country are based on location of customer site.