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Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total segment gross contribution $ 407,957 $ 217,247
Costs and expenses:    
Cost of services and product development - unallocated 435,139 377,033
Selling, general and administrative 657,090 617,904
Acquisition and integration charges 1,368 2,207
Gain from sale of divested operation (139,316) 0
Operating income 407,957 217,247
Interest expense and other, net (29,757) (2,188)
Gain on event cancellation insurance claims 3,077 0
Less: Provision for income taxes 85,494 42,544
Net income $ 295,783 172,515
Maximum    
Costs and expenses:    
Percent of target bonus charges allocated to segments 100.00%  
Operating Segments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total segment gross contribution $ 977,110 897,515
Costs and expenses:    
Operating income 977,110 897,515
Corporate and Reconciling Items    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total segment gross contribution (569,153) (680,268)
Costs and expenses:    
Cost of services and product development - unallocated 3,380 11,808
Selling, general and administrative 657,090 617,904
Depreciation and amortization 46,631 48,349
Acquisition and integration charges 1,368 2,207
Operating income $ (569,153) $ (680,268)