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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization $ 63,951 $ 55,089 $ 187,150 $ 167,251
Direct Advertising Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization 59,556 51,360 175,871 155,832
General and Administrative Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization 942 927 3,203 2,935
Corporate Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization $ 3,453 $ 2,802 $ 8,076 $ 8,484