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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 89,876 |  | $ 100,077 |
Loss from operations | (87,591) |  | (9,292) |
Selling, marketing, administrative and other expenses | (54,049) |  | (56,623) |
Amortization of intangible assets | (2,217) |  | (2,514) |
Goodwill impairment | (83,895) |  | 0 |
Restructuring and related costs | (1,507) |  | (6,624) |
Interest expense and other income |  |  | 512 |
Interest expense, other income and loss on investments | (711) |  |  |
Loss before income taxes | (88,302) |  | (8,780) |
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 89,876 |  | 100,077 |
Segment expenses | (35,799) | [1] | (43,608) | [2]
Loss from operations | 54,077 |  | 56,469 |
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 | 73,472 |  | 81,224 |
Segment expenses | (26,136) | [1] | (31,944) | [2]
Loss from operations | 47,336 |  | 49,280 |
Consulting Segment Member |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill impairment | 0 |  |  |
Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 16,378 |  | 18,498 |
Segment expenses | (8,899) | [1] | (10,886) | [2]
Loss from operations | 7,479 |  | 7,612 |
Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 26 |  | 355 |
Segment expenses | (764) | [1] | (778) | [2]
Loss from operations | (738) |  | (423) |
Research [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 68,414 |  | 76,581 |
Research [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 68,414 |  | 76,581 |
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 | 21,436 |  | 23,141 |
Consulting [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 21,436 |  | 23,141 |
Consulting [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 5,058 |  | 4,643 |
Consulting [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 16,378 |  | 18,498 |
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 | 26 |  | 355 |
Events [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 26 |  | 355 |
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 | 26 |  | 355 |
Compensation Benefits and Related Costs [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (30,186) | [1] | (36,416) | [2]
Compensation Benefits and Related Costs [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (22,552) | [1] | (27,263) | [2]
Compensation Benefits and Related Costs [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (6,907) | [1] | (8,380) | [2]
Compensation Benefits and Related Costs [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (727) | [1] | (773) | [2]
Professional Services [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (3,205) | [1] | (4,132) | [2]
Professional Services [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (2,691) | [1] | (3,651) | [2]
Professional Services [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (513) | [1] | (478) | [2]
Professional Services [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (1) | [1] | (3) | [2]
Billable Expenses [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (1,440) | [1] | (2,088) | [2]
Billable Expenses [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (83) | [1] | (148) | [2]
Billable Expenses [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (1,357) | [1] | (1,940) | [2]
Billable Expenses [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | 0 | [1] | 0 | [2]
Travel and Entertainment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (505) | [1] | (388) | [2]
Travel and Entertainment [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (389) | [1] | (299) | [2]
Travel and Entertainment [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (112) | [1] | (84) | [2]
Travel and Entertainment [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (4) | [1] | (5) | [2]
Software [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (394) | [1] | (462) | [2]
Software [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (377) | [1] | (458) | [2]
Software [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | 0 | [1] | 0 | [2]
Software [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (17) | [1] | (4) | [2]
Other Segment Expenses [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (69) | [1],[3] | (122) | [2],[4]
Other Segment Expenses [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (44) | [1],[3] | (125) | [2],[4]
Other Segment Expenses [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | (10) | [1],[3] | (4) | [2],[4]
Other Segment Expenses [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Segment expenses | $ (15) | [1],[3] | $ 7 | [2],[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.

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