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Revenue and Related Matters - Timing Of Revenue Recognition Liabilities per Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 5,475,846 | $ 4,733,962 | $ 4,099,403
Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,560,809 | 4,075,639 | 3,609,657
Transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 915,037 | 658,323 | 489,746
Research |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,604,791 | 4,101,392 | 3,602,892
Research | Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4,182,747 | 3,740,694 | 3,313,111
Research | Transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 422,044 | 360,698 | 289,781
Conferences |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 389,273 | 214,449 | 120,140
Conferences | Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Conferences | Transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 389,273 | 214,449 | 120,140
Consulting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 481,782 | 418,121 | 376,371
Consulting | Transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 378,062 | 334,945 | 296,546
Consulting | Transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 103,720 | $ 83,176 | $ 79,825

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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