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Segment Information - Reconciliation of Segment Gross Contribution to Net Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues $ 6,267,411 $ 5,906,956 $ 5,475,846
Personnel expenses 1,517,910 1,436,603 1,277,382
Product and content delivery expenses 410,223 380,887 348,175
Other expenses 61,734 54,083 35,155
Gross contribution 4,277,544 4,035,383 3,815,134
Cost of services and product development - unallocated 33,155 31,667 33,059
Selling, general and administrative 2,884,814 2,701,542 2,480,944
Depreciation and amortization 202,315 191,103 191,946
Acquisition and integration charges 973 9,587 9,079
Gain from sale of divested operation 0 (135,410) 0
Interest expenses and other, net 68,913 92,842 72,911
Gain on event cancellation insurance claims (300,000) (3,077) 0
Income before income taxes $ 1,387,374 1,147,129 1,027,195
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%    
Research      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues $ 5,125,650 4,887,046 4,604,791
Conferences      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 583,224 505,164 389,273
Consulting      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 558,537 514,746 481,782
Operating Segments | Research      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 5,125,650 4,887,046 4,604,791
Personnel expenses 1,125,694 1,071,315 963,437
Product and content delivery expenses 179,784 193,234 212,143
Other expenses 27,329 22,354 14,637
Gross contribution 3,792,843 3,600,143 3,414,574
Operating Segments | Conferences      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 583,224 505,164 389,273
Personnel expenses 67,326 56,708 43,176
Product and content delivery expenses 215,664 178,675 125,528
Other expenses 18,825 16,042 9,843
Gross contribution 281,409 253,739 210,726
Operating Segments | Consulting      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total revenues 558,537 514,746 481,782
Personnel expenses 324,890 308,580 270,769
Product and content delivery expenses 14,775 8,978 10,504
Other expenses 15,580 15,687 10,675
Gross contribution $ 203,292 $ 181,501 $ 189,834