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Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenues $ 1,534,130 $ 1,472,926
United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 993,829 961,850
Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 363,145 334,473
Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 177,156 176,603
Research    
Disaggregation of Revenue [Line Items]    
Total revenues 1,321,827 1,268,172
Research | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 847,281 835,221
Research | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 321,700 287,543
Research | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 152,846 145,408
Conferences    
Disaggregation of Revenue [Line Items]    
Total revenues 72,597 70,069
Conferences | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 55,584 48,090
Conferences | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 9,142 10,328
Conferences | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 7,871 11,651
Consulting    
Disaggregation of Revenue [Line Items]    
Total revenues 139,706 134,685
Consulting | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 90,964 78,539
Consulting | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 32,303 36,602
Consulting | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues $ 16,439 $ 19,544