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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Goodwill acquisition |  | $ 1,428 |
Foreign currency translation adjustment | $ 37,577 | (8,219) |
Goodwill | 1,216,425 | 1,178,997 | $ 1,144,416
Accumulated impairment losses | (762,566) | (762,566) | (762,566)
Goodwill | 453,859 | 416,431 | 381,850
Autoguide LLC |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquisition | (149) | 41,372 |
Goodwill | 41,223 |  |
Industrial Automation |  |  |
Goodwill [Line Items] |  |  |
Foreign currency translation adjustment | 37,418 | (8,247) |
Goodwill | 433,752 | 396,483 | 363,358
Goodwill | 433,752 | 396,483 | 363,358
Industrial Automation | Autoguide LLC |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquisition | (149) | 41,372 |
Wireless Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 361,819 | 361,819 | 361,819
Accumulated impairment losses | (353,843) | (353,843) | (353,843)
Goodwill | 7,976 | 7,976 | 7,976
Semiconductor Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill acquisition |  | 1,428 |
Foreign currency translation adjustment | 159 | 28 |
Goodwill | 262,155 | 261,996 | 260,540
Accumulated impairment losses | (260,540) | (260,540) | (260,540)
Goodwill | 1,615 | 1,456 |
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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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