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Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues $ 1,534,130 $ 1,472,926
Personnel expenses 386,199 363,644
Product and content delivery expenses 68,612 73,571
Other 14,022 13,599
Gross contribution 1,065,297 1,022,112
Cost of services and product development - unallocated 6,197 8,627
Selling, general and administrative 730,308 689,833
Depreciation and amortization 50,760 49,307
Acquisition and integration charges 0 460
Interest expenses and other, net 11,024 14,328
Income before income taxes 267,008 259,557
Research    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues 1,321,827 1,268,172
Conferences    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues 72,597 70,069
Consulting    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues $ 139,706 $ 134,685
Maximum    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Percent of target bonus charges allocated to segments 100.00% 100.00%
Operating Segments | Research    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues $ 1,321,827 $ 1,268,172
Personnel expenses 289,361 274,588
Product and content delivery expenses 41,177 43,587
Other 6,766 5,427
Gross contribution 984,523 944,570
Operating Segments | Conferences    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues 72,597 70,069
Personnel expenses 17,746 15,683
Product and content delivery expenses 24,172 27,793
Other 3,297 3,338
Gross contribution 27,382 23,255
Operating Segments | Consulting    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Total revenues 139,706 134,685
Personnel expenses 79,092 73,373
Product and content delivery expenses 3,263 2,191
Other 3,959 4,834
Gross contribution $ 53,392 $ 54,287