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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 67,750	$ 60,622	$ 136,377	$ 121,371
Direct advertising expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	62,913	56,276	127,150	112,748
General and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	1,271	1,163	2,446	2,270
Corporate expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 3,566	$ 3,183	$ 6,781	$ 6,353