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Segment Information - Information About Reportable Segments (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 3    
Operating income $ 1,100,106,000 $ 915,751,000 $ 490,150,000
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Revenues 0    
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 5,475,846,000 4,733,962,000 4,099,403,000
Operating income 3,815,134,000 3,329,516,000 2,770,898,000
Operating Segments | Research      
Segment Reporting Information [Line Items]      
Revenues 4,604,791,000 4,101,392,000 3,602,892,000
Operating income 3,414,574,000 3,036,925,000 2,597,852,000
Operating Segments | Conferences      
Segment Reporting Information [Line Items]      
Revenues 389,273,000 214,449,000 120,140,000
Operating income 210,726,000 133,748,000 57,302,000
Operating Segments | Consulting      
Segment Reporting Information [Line Items]      
Revenues 481,782,000 418,121,000 376,371,000
Operating income 189,834,000 158,843,000 115,744,000
Corporate and Reconciling Items      
Segment Reporting Information [Line Items]      
Operating income $ (2,715,028,000) $ (2,413,765,000) $ (2,280,748,000)