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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) (Granville-Phillips [Member], USD $) In Thousands, unless otherwise specified | 0 Months Ended | 9 Months Ended
--- | --- | ---
May 30, 2014 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets |  | $ 38,850
Acquired intangible assets | 38,850 |
Completed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets |  | 15,700
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets | 21,250 | 21,250
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets | $ 1,900 | $ 1,900

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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