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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2019
Goodwill [Line Items] |  |
Goodwill acquisition | $ 1,428 |
Foreign currency translation adjustment | 658 |
Goodwill | 1,144,416 | $ 1,146,502
Accumulated impairment losses | (762,566) | (762,566)
Goodwill | 381,850 | 383,936
Industrial Automation |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment | 626 |
Goodwill | 363,358 | 363,984
Accumulated impairment losses | 0 | 0
Goodwill | 363,358 | 363,984
Wireless Test |  |
Goodwill [Line Items] |  |
Goodwill | 361,819 | 361,819
Accumulated impairment losses | (353,843) | (353,843)
Goodwill | 7,976 | 7,976
Semiconductor Test |  |
Goodwill [Line Items] |  |
Goodwill acquisition | 1,428 |
Foreign currency translation adjustment | 32 |
Goodwill | 260,540 | 262,000
Accumulated impairment losses | (260,540) | (260,540)
Goodwill |  | 1,460
System Test |  |
Goodwill [Line Items] |  |
Goodwill | 158,699 | 158,699
Accumulated impairment losses | (148,183) | (148,183)
Goodwill | $ 10,516 | $ 10,516

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