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Significant Accounting Policies - Revenue and Expense Recognized for Advertising Barter Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Net revenues $ 7,862 $ 6,798 $ 7,153
Direct advertising expenses 3,005 2,900 2,766
General and administrative expenses $ 4,417 $ 3,699 $ 3,524