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Schedules of Concentration of Risk Based on Accounts Receivable (Detail) - Customer Concentration Risk - Consolidated Accounts Receivable
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Concentration Risk [Line Items]    
Concentration risk, percentage 22.00% 13.00%
Advertiser A    
Concentration Risk [Line Items]    
Concentration risk, percentage 14.00% 41.00%
Advertiser D    
Concentration Risk [Line Items]    
Concentration risk, percentage 28.00% 16.00%
Advertiser E    
Concentration Risk [Line Items]    
Concentration risk, percentage 19.00% [1]
[1] Less than 10%.