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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Total revenues $ 94,295   $ 102,527 $ 295,830 $ 324,429
Income (loss) from operations 4,457   (731) (76,178) 1,291
Selling, marketing, administrative and other expenses (51,292)   (56,904) (159,885) (169,618)
Amortization of intangible assets (2,217)   (2,404) (6,651) (7,431)
Goodwill impairment 0 $ (83,900) 0 (83,895) 0
Restructuring and related costs 111   (937) (1,887) (7,643)
Loss from sale of divested operation 0   (1,775) 0 (1,775)
Interest expense and other income     (343)   421
Interest expense, credit loss expense on note receivable and other income (6,146)     (6,697)  
Income (Loss) before income taxes (1,689)   (1,074) (82,875) 1,712
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 94,295   102,527 295,830 324,429
Segment expenses (36,440) [1]   (41,238) [2] (119,690) [3] (136,671) [4]
Income (loss) from operations 57,855   (61,289) 176,140 187,758
Research Segment [Member]          
Segment Reporting Information [Line Items]          
Goodwill impairment       (83,895)  
Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 78,139   81,405 235,326 251,792
Segment expenses (25,221) [1]   (27,989) [2] (77,539) [3] (90,389) [4]
Income (loss) from operations 52,918   53,416 157,787 161,403
Consulting Segment [Member]          
Segment Reporting Information [Line Items]          
Goodwill impairment       0  
Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 15,988   19,034 50,070 56,843
Segment expenses (9,536) [1]   (10,207) [2] (28,591) [3] (31,239) [4]
Income (loss) from operations 6,452   8,827 21,479 25,604
Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 168   2,088 10,434 15,794
Segment expenses (1,683) [1]   (3,042) [2] (13,560) [3] (15,043) [4]
Income (loss) from operations (1,515)   (954) (3,126) 751
Research [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 72,652   77,070 218,992 237,314
Research [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 72,652   77,070 218,992 237,314
Research [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0   0 0 0
Research [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0   0 0 0
Consulting [Member]          
Segment Reporting Information [Line Items]          
Total revenues 21,475   23,369 66,404 71,321
Consulting [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 21,475   23,369 66,404 71,321
Consulting [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 5,487   4,335 16,334 14,478
Consulting [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 15,988   19,034 50,070 56,843
Consulting [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0   0 0 0
Events [Member]          
Segment Reporting Information [Line Items]          
Total revenues 168   2,088 10,434 15,794
Events [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 168   2,088 10,434 15,794
Events [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0   0 0 0
Events [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 0   0 0 0
Events [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total revenues 168   2,088 10,434 15,794
Compensation Benefits and Related Costs [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (31,577) [1]   (33,679) [2] (94,420) [3] (105,702) [4]
Compensation Benefits and Related Costs [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (23,230) [1]   (24,636) [2] (69,196) [3] (77,797) [4]
Compensation Benefits and Related Costs [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (7,085) [1]   (7,612) [2] (21,248) [3] (23,481) [4]
Compensation Benefits and Related Costs [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (1,262) [1]   (1,431) [2] (3,976) [3] (4,424) [4]
Direct Costs of Events [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (405) [1]   (1,512) [2] (9,378) [3] (10,446) [4]
Direct Costs of Events [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses 0 [1]   0 [2] 0 [3] 0 [4]
Direct Costs of Events [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses 0 [1]   0 [2] 0 [3] 0 [4]
Direct Costs of Events [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (405) [1]   (1,512) [2] (9,378) [3] (10,446) [4]
Professional Services [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (1,961) [1]   (2,712) [2] (7,909) [3] (10,362) [4]
Professional Services [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (1,050) [1]   (2,186) [2] (5,398) [3] (8,947) [4]
Professional Services [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (960) [1]   (500) [2] (2,483) [3] (1,371) [4]
Professional Services [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses 49 [1]   (26) [2] (28) [3] (44) [4]
Billable Expenses [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (1,471) [1]   (2,125) [2] (4,769) [3] (6,536) [4]
Billable Expenses [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (135) [1]   (135) [2] (320) [3] (427) [4]
Billable Expenses [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (1,336) [1]   (1,990) [2] (4,449) [3] (6,109) [4]
Billable Expenses [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses 0 [1]   0 [2] 0 [3] 0 [4]
Travel and Entertainment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (647) [1]   (621) [2] (1,961) [3] (1,789) [4]
Travel and Entertainment [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (453) [1]   (486) [2] (1,470) [3] (1,446) [4]
Travel and Entertainment [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (143) [1]   (101) [2] (385) [3] (264) [4]
Travel and Entertainment [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (51) [1]   (34) [2] (106) [3] (79) [4]
Software [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (339) [1]   (480) [2] (1,104) [3] (1,438) [4]
Software [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (329) [1]   (460) [2] (1,060) [3] (1,410) [4]
Software [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses 0 [1]   0 [2] 0 [3] 0 [4]
Software [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (10) [1]   (20) [2] (44) [3] (28) [4]
Other Segment Expenses [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (40) [1],[5]   (109) [2],[6] (149) [3],[7] (398) [4],[8]
Other Segment Expenses [Member] | Research Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (24) [1],[5]   (86) [2],[6] (95) [3],[7] (362) [4],[8]
Other Segment Expenses [Member] | Consulting Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses (12) [1],[5]   (4) [2],[6] (26) [3],[7] (14) [4],[8]
Other Segment Expenses [Member] | Events Segment [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Segment expenses $ (4) [1],[5]   $ (19) [2],[6] $ (28) [3],[7] $ (22) [4],[8]
[1] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[2] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[3] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[4] The significant expense categories and amounts align with the segment-level information that is regularly provided to the chief operating decision maker.
[5] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.
[6] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.
[7] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.
[8] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.