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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Total revenues $ 1,408,784 $ 1,331,868 $ 4,320,838 $ 3,971,129
United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 917,462 883,227 2,864,991 2,612,950
Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 321,713 289,771 963,438 897,082
Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 169,609 158,870 492,409 461,097
Research        
Disaggregation of Revenue [Line Items]        
Total revenues 1,218,739 1,147,823 3,643,815 3,426,532
Research | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 822,401 771,534 2,444,524 2,264,733
Research | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 261,813 245,093 788,725 763,639
Research | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 134,525 131,196 410,566 398,160
Conferences        
Disaggregation of Revenue [Line Items]        
Total revenues 57,200 77,031 290,739 200,910
Conferences | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 7,652 44,499 179,670 139,418
Conferences | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 30,398 18,034 78,408 40,308
Conferences | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues 19,150 14,498 32,661 21,184
Consulting        
Disaggregation of Revenue [Line Items]        
Total revenues 132,845 107,014 386,284 343,687
Consulting | United States and Canada        
Disaggregation of Revenue [Line Items]        
Total revenues 87,409 67,194 240,797 208,799
Consulting | Europe, Middle East and Africa        
Disaggregation of Revenue [Line Items]        
Total revenues 29,502 26,644 96,305 93,135
Consulting | Other International        
Disaggregation of Revenue [Line Items]        
Total revenues $ 15,934 $ 13,176 $ 49,182 $ 41,753