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Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total revenues $ 1,524,072 $ 1,484,306 $ 4,744,656 $ 4,552,292
United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 907,568 923,834 2,957,819 2,940,465
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 418,727 369,039 1,209,780 1,072,472
Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 197,777 191,433 577,057 539,355
Insights        
Disaggregation of Revenue [Line Items]        
Total revenues 1,270,724 1,209,524 3,789,798 3,582,238
Insights | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 770,945 777,405 2,342,406 2,313,152
Insights | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 340,492 288,649 977,139 841,781
Insights | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 159,287 143,470 470,253 427,305
Conferences        
Disaggregation of Revenue [Line Items]        
Total revenues 74,554 75,776 358,558 331,929
Conferences | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 11,433 8,191 205,302 187,400
Conferences | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 39,356 40,486 103,793 97,443
Conferences | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 23,765 27,099 49,463 47,086
Consulting        
Disaggregation of Revenue [Line Items]        
Total revenues 123,573 127,622 418,873 405,291
Consulting | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 78,299 79,448 261,042 248,930
Consulting | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 32,987 30,637 108,086 101,920
Consulting | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 12,287 17,537 49,745 54,441
Other        
Disaggregation of Revenue [Line Items]        
Total revenues 55,221 71,384 177,427 232,834
Other | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 46,891 58,790 149,069 190,983
Other | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 5,892 9,267 20,762 31,328
Other | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues $ 2,438 $ 3,327 $ 7,596 $ 10,523