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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019
Goodwill [Line Items] |  |
Goodwill acquisition | $ 1,145 |
Foreign currency translation adjustment | (3,482) |
Goodwill | 1,144,416 | $ 1,142,079
Accumulated impairment losses | (762,566) | (762,566)
Goodwill | 381,850,000 | 379,513,000
Industrial Automation |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment | (3,494) |
Goodwill | 363,358 | 359,864
Goodwill | 363,358 | 359,864
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 | 1,145 |
Foreign currency translation adjustment | 12 |
Goodwill | 260,540 | 261,697
Accumulated impairment losses | (260,540) | (260,540)
Goodwill |  | 1,157
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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