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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]          
Foreign currency translation adjustment     $ 28,668 $ (10,124)  
Goodwill impairment losses $ 0 $ (254,946) [1],[2] 0 (254,946)  
Goodwill 985,909   1,014,577 985,909 $ 996,033
Accumulated impairment losses (762,566)   (762,566) (762,566) (507,620)
Goodwill 223,343   252,011 223,343 488,413
Industrial Automation          
Goodwill [Line Items]          
Foreign currency translation adjustment     28,668 (10,124)  
Goodwill 204,851   233,519 204,851 214,975
Goodwill 204,851   233,519 204,851 214,975
System Test          
Goodwill [Line Items]          
Goodwill 158,699   158,699 158,699 158,699
Accumulated impairment losses (148,183)   (148,183) (148,183) (148,183)
Goodwill 10,516   10,516 10,516 10,516
Wireless Test          
Goodwill [Line Items]          
Goodwill impairment losses   (254,900)   (254,946)  
Goodwill 361,819   361,819 361,819 361,819
Accumulated impairment losses (353,843)   (353,843) (353,843) (98,897)
Goodwill 7,976 $ 8,000 7,976 7,976 262,922
Semiconductor Test          
Goodwill [Line Items]          
Goodwill 260,540   260,540 260,540 260,540
Accumulated impairment losses $ (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 a $1.4 million fair value adjustment to increase contingent consideration liability, of which $0.8 million was related to Universal Robots and $0.6 million was 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.