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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Total revenues $ 135,589 $ 148,246 $ 249,259 $ 273,217
Segment expenses (54,489) (58,007) (103,980) (108,255)
Selling, marketing, administrative and other expenses (59,212) (66,182) (123,876) (131,072)
Amortization of intangible assets (3,068) (3,354) (6,134) (6,716)
Restructuring and related costs (10,532) 0 (12,121) 0
Interest expense, other income, and gains on investments 216 (432) (459) (876)
Income before income taxes 8,072 20,271 2,689 26,298
Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 94,702 100,368 183,527 197,338
Segment expenses (32,536) (32,897) (68,043) (67,077)
Consulting Segment Member        
Segment Reporting Information [Line Items]        
Total revenues 22,967 28,341 46,798 55,582
Segment expenses (11,429) (14,059) (23,782) (28,376)
Events Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 17,920 19,537 18,934 20,297
Segment expenses (10,524) (11,051) (12,155) (12,802)
Research [Member]        
Segment Reporting Information [Line Items]        
Total revenues 87,699 89,447 168,605 175,227
Research [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 87,699 89,447 168,605 175,227
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 29,970 39,262 61,720 77,693
Consulting [Member] | Research Segment [Member]        
Segment Reporting Information [Line Items]        
Total revenues 7,003 10,921 14,922 22,111
Consulting [Member] | Consulting Segment Member        
Segment Reporting Information [Line Items]        
Total revenues 22,967 28,341 46,798 55,582
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 17,920 19,537 18,934 20,297
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 $ 17,920 $ 19,537 $ 18,934 $ 20,297