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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Change in Carrying Amount of Goodwill | The change in the carrying amount of goodwill for the three months ended March 31, 2026 is summarized as follows (in thousands):
| Research Segment |  |  | Consulting Segment |  |  | Total |
Balance at December 31, 2025 | $ | 112,080 |  |  | $ | 8,301 |  |  | $ | 120,381 |
Impairment |  | (10,800 | ) |  |  | — |  |  |  | (10,800 | )
Translation adjustments |  | (430 | ) |  |  | (31 | ) |  |  | (461 | )
Balance at March 31, 2026 | $ | 100,850 |  |  | $ | 8,270 |  |  | $ | 109,120 |
Summary of Intangible Assets | The carrying values of finite-lived intangible assets are as follows (in thousands):
| March 31, 2026 |
| Gross |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer relationships | $ | 77,000 |  |  | $ | 60,351 |  |  | $ | 16,649 |
Total | $ | 77,000 |  |  | $ | 60,351 |  |  | $ | 16,649 |
| December 31, 2025 |
| Gross |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer relationships | $ | 77,000 |  |  | $ | 58,270 |  |  | $ | 18,730 |
Total | $ | 77,000 |  |  | $ | 58,270 |  |  | $ | 18,730 |
Summary of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the three succeeding years is as follows (in thousands):
2026 (remainder) | $ | 6,243 |
2027 |  | 8,324 |
2028 |  | 2,082 |
Total | $ | 16,649 |

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