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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.

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