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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to the Carrying Amount of Goodwill by Reporting Unit | The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 30, 2024 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2023 (1) | $ | 2,657,549 |  |  | $ | 183,997 |  |  | $ | 95,714 |  |  | $ | 2,937,260 |
Foreign currency translation impact | 78 |  |  | 1 |  |  | 441 |  |  | 520 |
Balance at September 30, 2024 (1) | $ | 2,657,627 |  |  | $ | 183,998 |  |  | $ | 96,155 |  |  | $ | 2,937,780 |
(1)The Company does not have any accumulated goodwill impairment losses.
Schedule of Amortizable Intangible Assets | The tables below present reconciliations of the carrying amounts of the Company’s finite-lived intangible assets as of the dates indicated (in thousands).
September 30, 2024 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost at December 31, 2023 |  | $ | 1,077,183 |  |  | $ | 11,200 |  |  |  |  | $ | 10,200 |  |  | $ | 1,098,583 |
Intangible assets fully amortized |  | — |  |  | (11,200) |  |  |  |  | — |  |  | (11,200) |
Foreign currency translation impact |  | 14,764 |  |  | — |  |  |  |  | — |  |  | 14,764 |
Gross cost |  | 1,091,947 |  |  | — |  |  |  |  | 10,200 |  |  | 1,102,147 |
Accumulated amortization (1) |  | (654,938) |  |  | — |  |  |  |  | (7,062) |  |  | (662,000) |
Balance at September 30, 2024 |  | $ | 437,009 |  |  | $ | — |  |  |  |  | $ | 3,138 |  |  | $ | 440,147 |
December 31, 2023 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost |  | $ | 1,077,183 |  |  | 11,200 |  |  |  |  | $ | 10,200 |  |  | $ | 1,098,583 |
Accumulated amortization (1) |  | (580,937) |  |  | (9,333) |  |  |  |  | (6,355) |  |  | (596,625) |
Balance at December 31, 2023 |  | $ | 496,246 |  |  | $ | 1,867 |  |  |  |  | $ | 3,845 |  |  | $ | 501,958 |
(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Technology-related—3 years; and Other—11 years.
Schedule of Estimated Future Amortization Expense by Year | The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).
2024 (remaining three months) | $ | 22,352 |
2025 | 82,606 |
2026 | 79,932 |
2027 | 79,324 |
2028 | 77,852 |
Thereafter | 98,081 |
| $ | 440,147 |

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