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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses in its Statements of Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Depreciation and Amortization Expense [Line Items]    
Depreciation and amortization $ 51,489 $ 49,230
Direct Advertising Expenses [Member]    
Depreciation and Amortization Expense [Line Items]    
Depreciation and amortization 47,798 45,085
General and Administrative Expenses [Member]    
Depreciation and Amortization Expense [Line Items]    
Depreciation and amortization 881 723
Corporate Expenses [Member]    
Depreciation and Amortization Expense [Line Items]    
Depreciation and amortization $ 2,810 $ 3,422