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Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,503,185 | $ 1,376,521 | $ 2,912,054 | $ 2,639,261
United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,012,380 | 912,753 | 1,947,529 | 1,729,723
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 330,923 | 310,500 | 641,725 | 607,311
Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 159,882 | 153,268 | 322,800 | 302,227
Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,207,885 | 1,142,329 | 2,425,076 | 2,278,709
Research | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 812,724 | 752,670 | 1,622,123 | 1,493,199
Research | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 258,255 | 255,417 | 526,912 | 518,546
Research | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 136,906 | 134,242 | 276,041 | 266,964
Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 168,897 | 113,525 | 233,539 | 123,879
Conferences | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 123,243 | 87,267 | 172,018 | 94,919
Conferences | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 38,803 | 21,036 | 48,010 | 22,274
Conferences | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6,851 | 5,222 | 13,511 | 6,686
Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 126,403 | 120,667 | 253,439 | 236,673
Consulting | United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 76,413 | 72,816 | 153,388 | 141,605
Consulting | Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 33,865 | 34,047 | 66,803 | 66,491
Consulting | Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 16,125 | $ 13,804 | $ 33,248 | $ 28,577

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