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Changes in Carrying Amount of Goodwill by Reporting Units (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013
Goodwill [Line Items] |  |  |
Goodwill | $ 757,995 | $ 761,501 | $ 770,515
Accumulated impairment losses | (408,723) | (408,723) | (408,723)
Goodwill | 349,272 | 352,778 | 361,792
ZTEC acquisition | 12,520 |  |
Activity during the year |  | (3,506) |
Semiconductor Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 260,540 | 260,540 | 260,540
Accumulated impairment losses | (260,540) | (260,540) | (260,540)
System Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 148,183 | 148,183 | 148,183
Accumulated impairment losses | (148,183) | (148,183) | (148,183)
Wireless Test |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 349,272 | 352,778 | 361,792
Goodwill | 349,272 | 352,778 | 361,792
ZTEC acquisition | 12,520 |  |
Activity during the year |  | $ (3,506) |

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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 -URI http://asc.fasb.org/extlink&oid=14024403&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 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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