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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 11, 2015
Oct. 31, 2014
Dec. 31, 2015
 [4],[5]
Oct. 04, 2015
 [6]
Jul. 05, 2015
 [7]
Apr. 05, 2015
Dec. 31, 2014
Sep. 28, 2014
 [1],[8]
Jun. 29, 2014
 [1]
Mar. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Line Items]                          
Goodwill impairment charge             $ 98,897 [1],[2],[3]         $ 98,897 $ 0
Fully amortized intangible assets wrote off                     $ 98,200    
Acquired intangible assets amortization     $ 19,911 $ 20,053 $ 15,258 $ 13,808 15,957 [1],[2],[3] $ 18,271 $ 18,271 $ 18,271 69,031 70,771 $ 72,447
Avionics Interface Technologies, LLC                          
Goodwill and Intangible Assets Disclosure [Line Items]                          
Intangible assets   $ 9,080                   $ 9,080  
Universal Robots                          
Goodwill and Intangible Assets Disclosure [Line Items]                          
Intangible assets $ 121,590                   $ 121,590    
System Test                          
Goodwill and Intangible Assets Disclosure [Line Items]                          
Goodwill impairment charge             $ 0            
[1] Dividends declared by Teradyne's Board of Directors were paid in the second, third and fourth quarters of 2014.
[2] In the fourth quarter ended December 31, 2014, Teradyne recorded a goodwill impairment charge of $98.9 million in its Wireless Test segment.
[3] 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.
[4] 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.
[5] 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.
[6] Restructuring and other includes a $(1.0) million fair value adjustment to decrease the AIT acquisition contingent consideration.
[7] Restructuring and other includes a $(1.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.
[8] Restructuring and other includes a $(0.6) million fair value adjustment to decrease the ZTEC acquisition contingent consideration.