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Goodwill - Changes in Carrying Value of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 82,029 | $ 81,689
Foreign currency exchange rate changes | (340) |
Goodwill, Ending Balance | 81,689 | 81,689
MVSD [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 77,556 | 77,388
Foreign currency exchange rate changes | (168) |
Goodwill, Ending Balance | 77,388 | 77,388
SISD [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 4,473 | 4,301
Foreign currency exchange rate changes | (172) |
Goodwill, Ending Balance | $ 4,301 | $ 4,301

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments 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 (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
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