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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Total revenues $ 118,136 $ 108,577 $ 360,587 $ 328,463
Segment expenses (43,684) (39,575) (132,740) (116,912)
Selling, marketing, administrative and other expenses (64,217) (63,778) (188,788) (181,463)
Amortization of intangible assets (3,696) (4,722) (11,567) (14,147)
Integration costs 0 (328) (334) (3,815)
Interest expense, other income (expense) and gains (losses) on investments (1,251) 1,533 (4,117) (1,904)
Income (loss) before income taxes 5,288 (1,359) 23,041 10,222
Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 90,463 86,323 272,006 260,134
Segment expenses (28,657) (28,645) (88,791) (81,979)
Consulting Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 26,806 21,123 80,743 62,076
Segment expenses (13,061) (9,646) (38,237) (29,766)
Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 867 1,131 7,838 6,253
Segment expenses (1,966) (1,284) (5,712) (5,167)
Research [Member]        
Segment Reporting Information [Line Items]        
Total revenues 79,876 74,445 235,846 223,746
Research [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 79,876 74,445 235,846 223,746
Research [Member] | Consulting Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Research [Member] | Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Consulting [Member]        
Segment Reporting Information [Line Items]        
Total revenues 37,393 33,001 116,903 98,464
Consulting [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 10,587 11,878 36,160 36,388
Consulting [Member] | Consulting Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 26,806 21,123 80,743 62,076
Consulting [Member] | Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Events [Member]        
Segment Reporting Information [Line Items]        
Total revenues 867 1,131 7,838 6,253
Events [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Events [Member] | Consulting Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 0 0 0 0
Events [Member] | Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues $ 867 $ 1,131 $ 7,838 $ 6,253