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Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Total revenues $ 1,408,869 $ 1,262,740
United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 935,149 816,970
Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 310,802 296,811
Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 162,918 148,959
Research    
Disaggregation of Revenue [Line Items]    
Total revenues 1,217,191 1,136,380
Research | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 809,399 740,529
Research | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 268,657 263,129
Research | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 139,135 132,722
Conferences    
Disaggregation of Revenue [Line Items]    
Total revenues 64,642 10,354
Conferences | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 48,775 7,652
Conferences | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 9,207 1,238
Conferences | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues 6,660 1,464
Consulting    
Disaggregation of Revenue [Line Items]    
Total revenues 127,036 116,006
Consulting | United States and Canada    
Disaggregation of Revenue [Line Items]    
Total revenues 76,975 68,789
Consulting | Europe, Middle East and Africa    
Disaggregation of Revenue [Line Items]    
Total revenues 32,938 32,444
Consulting | Other International    
Disaggregation of Revenue [Line Items]    
Total revenues $ 17,123 $ 14,773