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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.

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