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Operating Segments - Schedule of Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | $ 111,659 |  |  | $ 121,825 |  | $ 201,535 |  | $ 221,902 |
Income (loss) from operations | 6,956 |  |  | 11,314 |  | (80,635) |  | 2,022 |
Selling, marketing, administrative and other expenses | (55,718) |  |  | (57,424) |  | (109,767) |  | (114,047) |
Amortization of intangible assets | (2,217) |  |  | (2,513) |  | (4,434) |  | (5,027) |
Goodwill impairment | 0 |  | $ (83,900) | 0 |  | (83,895) |  | 0 |
Restructuring and related costs | (491) |  |  | (82) |  | (1,998) |  | (6,706) |
Interest expense and other income |  |  |  | 252 |  |  |  | 764 |
Interest expense, other income and loss on investments | 160 |  |  |  |  | (551) |  |  |
Income (Loss) before income taxes | 7,116 |  |  | 11,566 |  | (81,186) |  | 2,786 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 111,659 |  |  | 121,825 |  | 201,535 |  | 221,902 |
Segment expenses | (46,277) | [1] |  | (50,492) | [2] | (82,076) | [3] | (94,100) | [4]
Income (loss) from operations | 65,382 |  |  | 71,333 |  | 119,459 |  | 127,802 |
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 | 83,715 |  |  | 89,163 |  | 157,187 |  | 170,387 |
Segment expenses | (26,182) | [1] |  | (30,456) | [2] | (52,318) | [3] | (62,400) | [4]
Income (loss) from operations | 57,533 |  |  | 58,707 |  | 104,869 |  | 107,987 |
Consulting Segment Member |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  | 0 |  |  |
Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 17,704 |  |  | 19,311 |  | 34,082 |  | 37,809 |
Segment expenses | (10,156) | [1] |  | (10,146) | [2] | (19,055) | [3] | (21,032) | [4]
Income (loss) from operations | 7,548 |  |  | 9,165 |  | 15,027 |  | 16,777 |
Events Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 10,240 |  |  | 13,351 |  | 10,266 |  | 13,706 |
Segment expenses | (9,939) | [1] |  | (9,890) | [2] | (10,703) | [3] | (10,668) | [4]
Income (loss) from operations | 301 |  |  | 3,461 |  | (437) |  | 3,038 |
Research [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 77,926 |  |  | 83,663 |  | 146,340 |  | 160,244 |
Research [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 77,926 |  |  | 83,663 |  | 146,340 |  | 160,244 |
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 | 23,493 |  |  | 24,811 |  | 44,929 |  | 47,952 |
Consulting [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 23,493 |  |  | 24,811 |  | 44,929 |  | 47,952 |
Consulting [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 5,789 |  |  | 5,500 |  | 10,847 |  | 10,143 |
Consulting [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 17,704 |  |  | 19,311 |  | 34,082 |  | 37,809 |
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 | 10,240 |  |  | 13,351 |  | 10,266 |  | 13,706 |
Events [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total revenues | 10,240 |  |  | 13,351 |  | 10,266 |  | 13,706 |
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 | 10,240 |  |  | 13,351 |  | 10,266 |  | 13,706 |
Compensation Benefits and Related Costs [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (31,501) | [1] |  | (34,285) | [2] | (61,687) | [3] | (70,701) | [4]
Compensation Benefits and Related Costs [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (23,414) | [1] |  | (25,898) | [2] | (45,966) | [3] | (53,161) | [4]
Compensation Benefits and Related Costs [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (7,256) | [1] |  | (7,489) | [2] | (14,163) | [3] | (15,869) | [4]
Compensation Benefits and Related Costs [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (831) | [1] |  | (898) | [2] | (1,558) | [3] | (1,671) | [4]
Direct Costs of Events [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (8,973) | [1] |  | (8,934) | [2] | (8,973) | [3] | (8,934) | [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 | (8,973) | [1] |  | (8,934) | [2] | (8,973) | [3] | (8,934) | [4]
Professional Services [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (2,744) | [1] |  | (3,518) | [2] | (5,949) | [3] | (7,650) | [4]
Professional Services [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (1,657) | [1] |  | (3,110) | [2] | (4,348) | [3] | (6,761) | [4]
Professional Services [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (1,010) | [1] |  | (393) | [2] | (1,523) | [3] | (871) | [4]
Professional Services [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (77) | [1] |  | (15) | [2] | (78) | [3] | (18) | [4]
Billable Expenses [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (1,858) | [1] |  | (2,323) | [2] | (3,298) | [3] | (4,411) | [4]
Billable Expenses [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (102) | [1] |  | (144) | [2] | (185) | [3] | (292) | [4]
Billable Expenses [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (1,756) | [1] |  | (2,179) | [2] | (3,113) | [3] | (4,119) | [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 | (792) | [1] |  | (771) | [2] | (1,297) | [3] | (1,159) | [4]
Travel and Entertainment [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (628) | [1] |  | (661) | [2] | (1,017) | [3] | (960) | [4]
Travel and Entertainment [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (130) | [1] |  | (79) | [2] | (242) | [3] | (163) | [4]
Travel and Entertainment [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (34) | [1] |  | (31) | [2] | (38) | [3] | (36) | [4]
Software [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (371) | [1] |  | (496) | [2] | (765) | [3] | (958) | [4]
Software [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (354) | [1] |  | (492) | [2] | (731) | [3] | (950) | [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 | (17) | [1] |  | (4) | [2] | (34) | [3] | (8) | [4]
Other Segment Expenses [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (38) | [1],[5] |  | (165) | [2],[6] | (107) | [3],[7] | (287) | [4],[8]
Other Segment Expenses [Member] | Research Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (27) | [1],[5] |  | (151) | [2],[6] | (71) | [3],[7] | (276) | [4],[8]
Other Segment Expenses [Member] | Consulting Segment Member | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | (4) | [1],[5] |  | (6) | [2],[6] | (14) | [3],[7] | (10) | [4],[8]
Other Segment Expenses [Member] | Events Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Segment expenses | $ (7) | [1],[5] |  | $ (8) | [2],[6] | $ (22) | [3],[7] | $ (1) | [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.

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