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Segment Information - Information About Reportable Segments (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 3  
Operating income $ 407,957,000 $ 217,247,000
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Revenues 0  
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,408,869,000 1,262,740,000
Operating income 977,110,000 897,515,000
Operating Segments | Research    
Segment Reporting Information [Line Items]    
Revenues 1,217,191,000 1,136,380,000
Operating income 899,514,000 849,379,000
Operating Segments | Conferences    
Segment Reporting Information [Line Items]    
Revenues 64,642,000 10,354,000
Operating income 26,788,000 (2,876,000)
Operating Segments | Consulting    
Segment Reporting Information [Line Items]    
Revenues 127,036,000 116,006,000
Operating income 50,808,000 51,012,000
Corporate and Reconciling Items    
Segment Reporting Information [Line Items]    
Operating income $ (569,153,000) $ (680,268,000)