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Segment Information - Information About Reportable Segments (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     3  
Operating income $ 244,417,000 $ 253,418,000 $ 935,481,000 $ 767,787,000
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues     0  
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 1,408,784,000 1,331,868,000 4,320,838,000 3,971,129,000
Operating income 963,149,000 925,969,000 2,971,312,000 2,791,198,000
Operating Segments | Research        
Segment Reporting Information [Line Items]        
Revenues 1,218,739,000 1,147,823,000 3,643,815,000 3,426,532,000
Operating income 894,149,000 848,438,000 2,678,945,000 2,541,782,000
Operating Segments | Conferences        
Segment Reporting Information [Line Items]        
Revenues 57,200,000 77,031,000 290,739,000 200,910,000
Operating income 20,449,000 40,318,000 145,687,000 110,968,000
Operating Segments | Consulting        
Segment Reporting Information [Line Items]        
Revenues 132,845,000 107,014,000 386,284,000 343,687,000
Operating income 48,551,000 37,213,000 146,680,000 138,448,000
Corporate and Reconciling Items        
Segment Reporting Information [Line Items]        
Operating income $ (718,732,000) $ (672,551,000) $ (2,035,831,000) $ (2,023,411,000)