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Related Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Advertising expenses $ 30,500,000 $ 28,200,000 $ 28,000,000
Galore Media, Inc. | Maximum      
Related Party Transaction [Line Items]      
Advertising expenses 100,000    
Mark Friedman      
Related Party Transaction [Line Items]      
Professional Fees $ 0    
Consulting agreement termination date May 03, 2016    
Mark Friedman | Maximum      
Related Party Transaction [Line Items]      
Professional Fees   $ 100,000 $ 100,000