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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Total revenues $ 124,971 $ 113,781
Segment expenses (50,248) (44,606)
Selling, marketing, administrative and other expenses (64,890) (57,618)
Amortization of intangible assets (3,362) (3,903)
Integration costs 0 (118)
Interest expense, other income (expense) and gains (losses) on investments (444) (1,599)
Income before income taxes 6,027 5,937
Research Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 96,970 87,699
Segment expenses (34,180) (30,717)
Consulting Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 27,241 25,819
Segment expenses (14,317) (12,325)
Events Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 760 263
Segment expenses (1,751) (1,564)
Research [Member]    
Segment Reporting Information [Line Items]    
Total revenues 85,780 74,968
Research [Member] | Research Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 85,780 74,968
Research [Member] | Consulting Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Research [Member] | Events Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Consulting [Member]    
Segment Reporting Information [Line Items]    
Total revenues 38,431 38,550
Consulting [Member] | Research Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 11,190 12,731
Consulting [Member] | Consulting Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 27,241 25,819
Consulting [Member] | Events Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member]    
Segment Reporting Information [Line Items]    
Total revenues 760 263
Events [Member] | Research Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member] | Consulting Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member] | Events Segment [Member]    
Segment Reporting Information [Line Items]    
Total revenues $ 760 $ 263