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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.

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