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Revenues - Disaggregated Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 116,148 $ 119,943 $ 222,196 $ 223,830
Marketing Advertising Services And Sponsorship [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 85,979 87,134 161,496 159,417
Intelligence Subscription Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 18,623 19,682 37,280 38,528
Advisory Services [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue 11,507 13,114 23,288 25,660
Exhibitor And Attendee [Member]        
Disaggregation Of Revenue [Line Items]        
Total Revenue $ 39 $ 13 $ 132 $ 225