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Depreciation and Amortization - Depreciation and Amortization Expense Excluded from Operating Expenses in its Condensed Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization $ 61,237 $ 63,951 $ 187,548 $ 187,150
Direct Advertising Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization 57,556 59,556 176,395 175,871
General and Administrative Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization 1,126 942 3,558 3,203
Corporate Expenses [Member]        
Depreciation and Amortization Expense [Line Items]        
Depreciation and amortization $ 2,555 $ 3,453 $ 7,595 $ 8,076