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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Change in Carrying Amount of Goodwill | The change in the carrying amount of goodwill for the nine months ended September 30, 2025 is summarized as follows (in thousands):
| Research Segment |  |  | Consulting Segment |  |  | Total |
Balance at December 31, 2024 | $ | 219,814 |  |  | $ | 8,145 |  |  | $ | 227,959 |
Impairment |  | (83,895 | ) |  |  | — |  |  |  | (83,895 | )
Translation adjustments |  | 2,980 |  |  |  | 151 |  |  |  | 3,131 |
Balance at September 30, 2025 | $ | 138,899 |  |  | $ | 8,296 |  |  | $ | 147,195 |
Summary of Carrying Values of Finite-Lived Intangible Assets | The carrying values of finite-lived intangible assets are as follows (in thousands):
| September 30, 2025 |
| Gross |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer relationships | $ | 77,000 |  |  | $ | 56,189 |  |  | $ | 20,811 |
Technology |  | 13,000 |  |  |  | 12,987 |  |  |  | 13 |
Total | $ | 90,000 |  |  | $ | 69,176 |  |  | $ | 20,824 |
| December 31, 2024 |
| Gross |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer relationships | $ | 77,000 |  |  | $ | 49,946 |  |  | $ | 27,054 |
Technology |  | 13,000 |  |  |  | 12,978 |  |  |  | 22 |
Trademarks |  | 12,000 |  |  |  | 11,601 |  |  |  | 399 |
Total | $ | 102,000 |  |  | $ | 74,525 |  |  | $ | 27,475 |
Summary of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the four succeeding years is as follows (in thousands):
2025 (remainder) | $ | 2,095 |
2026 |  | 8,324 |
2027 |  | 8,324 |
2028 |  | 2,081 |
Total | $ | 20,824 |

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