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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Total revenues $ 113,431 $ 127,679 $ 362,690 $ 400,896
Segment expenses (46,519) (51,182) (150,499) (159,437)
Selling, marketing, administrative and other expenses (58,796) (64,588) (182,672) (195,660)
Amortization of intangible assets (3,041) (3,352) (9,175) (10,068)
Restructuring and related costs (19) 0 (12,140) 0
Interest expense, other income, and gains on investments (195) (238) (654) (1,114)
Income before income taxes 4,861 8,319 7,550 34,617
Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 87,123 96,053 270,650 293,391
Segment expenses (31,749) (33,058) (99,792) (100,135)
Consulting Segment Member        
Segment Reporting Information [Line Items]        
Total revenues 21,720 28,367 68,518 83,949
Segment expenses (10,739) (14,747) (34,521) (43,123)
Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 4,588 3,259 23,522 23,556
Segment expenses (4,031) (3,377) (16,186) (16,179)
Research [Member]        
Segment Reporting Information [Line Items]        
Total revenues 80,606 87,038 249,211 262,265
Research [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 80,606 87,038 249,211 262,265
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 28,237 37,382 89,957 115,075
Consulting [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 6,517 9,015 21,439 31,126
Consulting [Member] | Consulting Segment Member        
Segment Reporting Information [Line Items]        
Total revenues 21,720 28,367 68,518 83,949
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 4,588 3,259 23,522 23,556
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 $ 4,588 $ 3,259 $ 23,522 $ 23,556