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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Component Of Other Income And Expense [Line Items]      
Depreciation and amortization $ 300,579 $ 296,083 $ 299,639
Direct advertising expenses [Member]
      
Component Of Other Income And Expense [Line Items]      
Depreciation and amortization 283,280 277,662 283,720
General and administrative expenses [Member]
      
Component Of Other Income And Expense [Line Items]      
Depreciation and amortization 4,684 4,137 4,224
Corporate expenses [Member]
      
Component Of Other Income And Expense [Line Items]      
Depreciation and amortization $ 12,615 $ 14,284 $ 11,695