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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Component Of Other Income And Expense [Line Items]    
Depreciation and amortization $ 69,526 $ 73,901
Direct advertising expenses [Member]
    
Component Of Other Income And Expense [Line Items]    
Depreciation and amortization 65,592 68,226
General and administrative expenses [Member]
    
Component Of Other Income And Expense [Line Items]    
Depreciation and amortization 1,021 876
Corporate expenses [Member]
    
Component Of Other Income And Expense [Line Items]    
Depreciation and amortization $ 2,913 $ 4,799