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Contingent Earn-Out Consideration - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2014
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Sep. 30, 2014
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Dec. 10, 2013
Twitchy.com (business acquisition)
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Sep. 30, 2014
Twitchy.com (business acquisition)
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Sep. 30, 2014
Twitchy.com (business acquisition)
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Dec. 10, 2013
Twitchy.com (business acquisition)
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Sep. 30, 2014
Eagle Publishing (business acquisition)
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Jun. 30, 2014
Eagle Publishing (business acquisition)
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Sep. 30, 2014
Eagle Publishing (business acquisition)
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Jan. 10, 2014
Eagle Publishing (business acquisition)
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| Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] | ||||||||||
| Contingent earn-out consideration period | 2 years | 1 year 3 months | 2 years 6 months | |||||||
| Total contingent earn-out consideration | $ 1,000,000 | $ 1,000,000 | $ 1,200,000 | $ 8,500,000 | ||||||
| Estimated fair value of contingent earn-out consideration | 600,000 | 2,000,000 | ||||||||
| Change in fair value of contingent earn-out consideration | $ 545,000 | $ 914,000 | $ 58,000,000 | $ 275,000,000 | $ 600,000 | $ 500,000 | ||||