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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue Recognition [Line Items]      
Net revenues $ 6,798 $ 7,153 $ 6,608
Direct advertising expenses 2,900 2,766 2,768
General and administrative expenses $ 3,699 $ 3,524 $ 3,242