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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,484,306 | $ 1,408,784 | $ 4,552,292 | $ 4,320,838
United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 923,834 | 917,462 | 2,940,465 | 2,864,991
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 369,039 | 321,713 | 1,072,472 | 963,438
Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 191,433 | 169,609 | 539,355 | 492,409
Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,280,908 | 1,218,739 | 3,815,072 | 3,643,815
Research | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 836,195 | 822,401 | 2,504,135 | 2,444,524
Research | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 297,916 | 261,813 | 873,109 | 788,725
Research | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 146,797 | 134,525 | 437,828 | 410,566
Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 75,776 | 57,200 | 331,929 | 290,739
Conferences | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 8,191 | 7,652 | 187,400 | 179,670
Conferences | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 40,486 | 30,398 | 97,443 | 78,408
Conferences | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 27,099 | 19,150 | 47,086 | 32,661
Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 127,622 | 132,845 | 405,291 | 386,284
Consulting | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 79,448 | 87,409 | 248,930 | 240,797
Consulting | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 30,637 | 29,502 | 101,920 | 96,305
Consulting | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 17,537 | $ 15,934 | $ 54,441 | $ 49,182

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