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Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) (Granville-Phillips [Member], USD $) In Thousands, unless otherwise specified | 0 Months Ended | 9 Months Ended
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May 30, 2014 | Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets, purchase price | $ 38,850 |
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets, purchase price | 21,250 | 21,250
Estimated useful life of finite lived intangible assets | 7 years |
Trademarks and Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets, purchase price | 1,900 | 1,900
Estimated useful life of finite lived intangible assets | 12 years |
Current Developed Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangible assets, purchase price | $ 15,700 |
Current Developed Technology [Member] | Minimum [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of finite lived intangible assets | 9 years |
Current Developed Technology [Member] | Maximum [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of finite lived intangible assets | 12 years |

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- Details
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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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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