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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 03, 2016
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 11, 2015
Goodwill [Line Items]              
Goodwill $ 985,909   $ 781,058 $ 985,909 $ 996,033 $ 781,058  
Accumulated impairment losses (762,566)   (507,620) (762,566) (507,620) (507,620)  
Goodwill 223,343   273,438 223,343 488,413 273,438  
Foreign currency translation adjustment         (10,124) (6,153)  
Goodwill impairment losses 0 $ 254,946 [1],[2] 98,897 254,946 (254,946) 98,897  
Universal Robots              
Goodwill [Line Items]              
Goodwill             $ 221,128
Universal Robots acquisition           221,128  
Industrial Automation              
Goodwill [Line Items]              
Goodwill 204,851     204,851 214,975    
Goodwill 204,851     204,851 214,975    
Foreign currency translation adjustment         (10,124) (6,153)  
Industrial Automation | Universal Robots              
Goodwill [Line Items]              
Universal Robots acquisition           221,128  
System Test              
Goodwill [Line Items]              
Goodwill 158,699   158,699 158,699 158,699 158,699  
Accumulated impairment losses (148,183)   (148,183) (148,183) (148,183) (148,183)  
Goodwill 10,516   10,516 10,516 10,516 10,516  
Goodwill impairment losses     0        
Wireless Test              
Goodwill [Line Items]              
Goodwill 361,819   361,819 361,819 361,819 361,819  
Accumulated impairment losses (353,843)   (98,897) (353,843) (98,897) (98,897)  
Goodwill 7,976   262,922 7,976 262,922 262,922  
Goodwill impairment losses   $ 254,946   254,946 (254,946) 98,897  
Semiconductor Test              
Goodwill [Line Items]              
Goodwill 260,540   260,540 260,540 260,540 260,540  
Accumulated impairment losses $ (260,540)   $ (260,540) $ (260,540) $ (260,540) $ (260,540)  
[1] Restructuring and other includes $4.2 million for an impairment of fixed assets, $0.9 million for expenses related to an earthquake in Kumamoto, Japan, and $1.4 million for the increase in the fair value of contingent consideration liability of which $0.8 million related to Universal Robots, and $0.6 million related to AIT, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
[2] Teradyne recorded pension and post retirement net actuarial (gains) losses of $(1.2) million, $(0.7) million, $0.7 million and $(2.0) million for the first, second, third and fourth quarter in 2016, respectively. See Note B: "Accounting Policies" for a discussion of Teradyne's accounting policy.