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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 02, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Foreign currency translation adjustment | $ 6,722 |
Goodwill | 992,631 | $ 985,909
Accumulated impairment losses | (762,566) | (762,566)
Goodwill | 230,065 | 223,343
Wireless Test |  |
Goodwill [Line Items] |  |
Goodwill | 361,819 | 361,819
Accumulated impairment losses | (353,843) | (353,843)
Goodwill | 7,976 | 7,976
Industrial Automation |  |
Goodwill [Line Items] |  |
Foreign currency translation adjustment | 6,722 |
Goodwill | 211,573 | 204,851
Goodwill | 211,573 | 204,851
System Test |  |
Goodwill [Line Items] |  |
Goodwill | 158,699 | 158,699
Accumulated impairment losses | (148,183) | (148,183)
Goodwill | 10,516 | 10,516
Semiconductor Test |  |
Goodwill [Line Items] |  |
Goodwill | 260,540 | 260,540
Accumulated impairment losses | $ (260,540) | $ (260,540)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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