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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Oct. 04, 2015
Jul. 05, 2015
Dec. 31, 2014
Sep. 28, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information [Line Items]                
Changes to fair value of contingent consideration           $ 2,489 $ (630)  
Pension and post retirement net actuarial losses (gain) $ 17,732     $ 46,564   17,732 46,564 $ (10,340)
Goodwill impairment       $ 98,897 [1],[2],[3]     98,897 $ 0
ZTEC Instruments, Inc.                
Quarterly Financial Information [Line Items]                
Changes to fair value of contingent consideration     $ (1,600)   $ (630) (1,600) $ (630)  
Universal Robots                
Quarterly Financial Information [Line Items]                
Changes to fair value of contingent consideration 5,339         5,339    
Avionics Interface Technologies, LLC                
Quarterly Financial Information [Line Items]                
Changes to fair value of contingent consideration $ (300) $ (1,000)       $ (1,250)    
[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.