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Schedules of Concentration of Risk Based on Accounts Receivable (Detail) (Consolidated Accounts Receivable)
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12 Months Ended | |||||
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Dec. 31, 2014
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Dec. 31, 2013
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Advertiser A
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| Concentration Risk [Line Items] | ||||||
| Concentration Risk, Percentage | 41.00% | 41.00% | ||||
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Advertiser B
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| Concentration Risk [Line Items] | ||||||
| Concentration Risk, Percentage | [1] | 14.00% | ||||
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Advertiser C
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| Concentration Risk [Line Items] | ||||||
| Concentration Risk, Percentage | [1] | 13.00% | ||||
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Advertiser D
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| Concentration Risk [Line Items] | ||||||
| Concentration Risk, Percentage | 16.00% | [1] | ||||
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