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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Total revenues $ 85,454 $ 89,876
Loss from operations (18,630) (87,591)
Selling, marketing, administrative and other expenses (52,038) (53,475)
Amortization of intangible assets (2,081) (2,217)
Goodwill impairment (10,800) (83,895)
Restructuring and related costs (2,146) (1,507)
Interest expense and other income (91)  
Interest expense, credit loss expense and other income, and loss on investments   (711)
Loss before income taxes (18,721) (88,302)
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 85,454 89,876
Total segment expenses [1] (37,019) (36,373)
Loss from operations 48,435 (53,503)
Research Segment [Member]    
Segment Reporting Information [Line Items]    
Goodwill impairment (10,800)  
Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 71,732 73,472
Total segment expenses (26,610) [2] (26,136) [1]
Loss from operations 45,122 47,336
Consulting Segment [Member]    
Segment Reporting Information [Line Items]    
Goodwill impairment 0  
Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 13,740 16,378
Total segment expenses (9,021) [2] (8,899) [1]
Loss from operations 4,719 7,479
Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues (18) 26
Total segment expenses (1,388) [2] (1,338) [1]
Loss from operations (1,406) (1,312)
Research [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 66,890 68,414
Research [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 66,890 68,414
Research [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Research [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Consulting [Member]    
Segment Reporting Information [Line Items]    
Total revenues 18,582 21,436
Consulting [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 18,582 21,436
Consulting [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 4,842 5,058
Consulting [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 13,740 16,378
Consulting [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member]    
Segment Reporting Information [Line Items]    
Total revenues (18) 26
Events [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues (18) 26
Events [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues 0 0
Events [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total revenues (18) 26
Compensation Benefits and Related Costs [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (31,469) [2] (30,758) [1]
Compensation Benefits and Related Costs [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (23,179) [2] (22,552) [1]
Compensation Benefits and Related Costs [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (6,955) [2] (6,907) [1]
Compensation Benefits and Related Costs [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (1,335) [2] (1,299) [1]
Professional Services [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (3,179) [2] (3,205) [1]
Professional Services [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (2,448) [2] (2,691) [1]
Professional Services [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (731) [2] (513) [1]
Professional Services [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses 0 [2] (1) [1]
Billable Expenses [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (1,313) [2] (1,440) [1]
Billable Expenses [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (73) [2] (83) [1]
Billable Expenses [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (1,240) [2] (1,357) [1]
Billable Expenses [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses 0 [2] 0 [1]
Travel and Entertainment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (547) [2] (506) [1]
Travel and Entertainment [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (446) [2] (389) [1]
Travel and Entertainment [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (75) [2] (112) [1]
Travel and Entertainment [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (26) [2] (5) [1]
Software [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses [1] (457) (394)
Software [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses [1] (434) (377)
Software [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses [1] (10) 0
Software [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses [1] (13) (17)
Other Segment Expenses [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (54) [2],[3] (70) [1],[4]
Other Segment Expenses [Member] | Research Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (30) [2],[3] (44) [1],[4]
Other Segment Expenses [Member] | Consulting Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses (10) [2],[3] (10) [1],[4]
Other Segment Expenses [Member] | Events Segment [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total segment expenses $ (14) [2],[3] $ (16) [1],[4]
[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] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.
[4] Other segment expenses for each reportable segment includes office supplies, maintenance, and training expenses.