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Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenues $ 6,267,411 $ 5,906,956 $ 5,475,846
United States and Canada      
Disaggregation of Revenue [Line Items]      
Total revenues 4,017,730 3,911,042 3,619,382
Europe, Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Total revenues 1,517,815 1,332,070 1,234,659
Other International      
Disaggregation of Revenue [Line Items]      
Total revenues 731,866 663,844 621,805
Research      
Disaggregation of Revenue [Line Items]      
Total revenues 5,125,650 4,887,046 4,604,791
Research | United States and Canada      
Disaggregation of Revenue [Line Items]      
Total revenues 3,319,879 3,275,866 3,056,096
Research | Europe, Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Total revenues 1,209,660 1,060,959 1,017,860
Research | Other International      
Disaggregation of Revenue [Line Items]      
Total revenues 596,111 550,221 530,835
Conferences      
Disaggregation of Revenue [Line Items]      
Total revenues 583,224 505,164 389,273
Conferences | United States and Canada      
Disaggregation of Revenue [Line Items]      
Total revenues 354,011 317,531 263,165
Conferences | Europe, Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Total revenues 165,306 140,640 88,979
Conferences | Other International      
Disaggregation of Revenue [Line Items]      
Total revenues 63,907 46,993 37,129
Consulting      
Disaggregation of Revenue [Line Items]      
Total revenues 558,537 514,746 481,782
Consulting | United States and Canada      
Disaggregation of Revenue [Line Items]      
Total revenues 343,840 317,645 300,121
Consulting | Europe, Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Total revenues 142,849 130,471 127,820
Consulting | Other International      
Disaggregation of Revenue [Line Items]      
Total revenues $ 71,848 $ 66,630 $ 53,841