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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 03, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Apr. 25, 2018 | Feb. 26, 2018
Goodwill [Line Items] |  |  |  |  |  |
Foreign currency translation adjustment |  | $ (20,531) | $ 28,668 |  |  |
Goodwill impairment losses |  |  | (254,946) |  |  |
Goodwill |  | 1,014,577 | 985,909 | $ 1,144,416 |  |
Accumulated impairment losses |  | (762,566) | (762,566) | (762,566) |  |
Goodwill |  | 252,011 | 223,343 | 381,850 |  |
Mobile Industrial Robots (MiR) |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill acquisition |  | 135,976 |  |  |  |
Goodwill |  |  |  |  | $ 135,976 |
Energid Technologies Corporation |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill acquisition |  | 14,394 |  |  |  |
Goodwill |  |  |  |  |  | $ 14,400
Industrial Automation |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Foreign currency translation adjustment |  | (20,531) | 28,668 |  |  |
Goodwill |  | 233,519 | 204,851 | 363,358 |  |
Goodwill |  | 233,519 | 204,851 | 363,358 |  |
Industrial Automation | Mobile Industrial Robots (MiR) |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill acquisition |  | 135,976 |  |  |  |
Industrial Automation | Energid Technologies Corporation |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill acquisition |  | 14,394 |  |  |  |
Wireless Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill impairment losses | $ (254,900) |  | (254,946) |  |  |
Goodwill |  | 361,819 | 361,819 | 361,819 |  |
Accumulated impairment losses |  | (353,843) | (353,843) | (353,843) |  |
Goodwill | $ 8,000 | 7,976 | 7,976 | 7,976 |  |
Semiconductor Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | 260,540 | 260,540 | 260,540 |  |
Accumulated impairment losses |  | (260,540) | (260,540) | (260,540) |  |
Goodwill |  | 0 | 0 | 0 |  |
System Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | 158,699 | 158,699 | 158,699 |  |
Accumulated impairment losses |  | (148,183) | (148,183) | (148,183) |  |
Goodwill |  | $ 10,516 | $ 10,516 | $ 10,516 |  |

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