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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Jun. 11, 2015 | Oct. 31, 2014 | Oct. 25, 2013
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 781,058 | $ 770,515 | $ 996,033 |  |  |
Accumulated impairment losses | (507,620) | (408,723) | (507,620) |  |  |
Goodwill | 273,438 |  | 488,413 |  |  |
Foreign currency translation adjustment | (6,153) |  |  |  |  |
ZTEC Instruments, Inc. |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 12,520
Adjustment |  | 27 |  |  |  |
Avionics Interface Technologies, LLC |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 10,516 |
Acquisition |  | 10,516 |  |  |  |
Universal Robots |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 221,128 |  |
Acquisition | 221,128 |  |  |  |  |
Semiconductor Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 361,819 | 361,792 | 361,819 |  |  |
Accumulated impairment losses | (98,897) |  | (98,897) |  |  |
Goodwill |  |  | 262,922 |  |  |
Semiconductor Test | ZTEC Instruments, Inc. |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Adjustment |  | 27 |  |  |  |
Industrial Automation |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  | 214,975 |  |  |
Goodwill |  |  | 214,975 |  |  |
Foreign currency translation adjustment | (6,153) |  |  |  |  |
Industrial Automation | Universal Robots |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition | 221,128 |  |  |  |  |
System Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 158,699 | 148,183 | 158,699 |  |  |
Accumulated impairment losses | (148,183) | (148,183) | (148,183) |  |  |
Goodwill |  |  | 10,516 |  |  |
System Test | Avionics Interface Technologies, LLC |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition |  | 10,516 |  |  |  |
Wireless Test |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 260,540 | 260,540 | 260,540 |  |  |
Accumulated impairment losses | $ (260,540) | $ (260,540) | $ (260,540) |  |  |

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