Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended
	May 31, 2021	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution		$ 297,122		$ 274,714		$ 514,369	$ 500,126
Costs and expenses:
Cost of services and product development - unallocated		424,535		350,802		801,568	685,269
Selling, general and administrative		604,911		488,496		1,222,815	975,751
Acquisition and integration charges		2,289		1,302		4,496	1,942
Operating income		297,122		274,714		514,369	500,126
Interest expense and other, net		(21,171)		(31,072)		(23,359)	(41,731)
Gain on event cancellation insurance claims	$ 135,500	0		135,545		0	135,545
Less: Provision for income taxes		71,026		107,951		113,570	158,604
Net income		204,925	$ 172,515	271,236	$ 164,100	377,440	435,336
Reportable segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution		967,714		827,503		1,865,229	1,604,869
Costs and expenses:
Operating income		967,714		827,503		$ 1,865,229	1,604,869
Reportable segments | Maximum
Costs and expenses:
Percent of target bonus allocated to segments						100.00%
Corporate and other expenses
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment gross contribution		(670,592)		(552,789)		$ (1,350,860)	(1,104,743)
Costs and expenses:
Cost of services and product development - unallocated		15,728		10,986		27,536	18,781
Selling, general and administrative		604,911		488,496		1,222,815	975,751
Depreciation and amortization		47,664		52,005		96,013	108,269
Acquisition and integration charges		2,289		1,302		4,496	1,942
Operating income		$ (670,592)		$ (552,789)		$ (1,350,860)	$ (1,104,743)