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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
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, 2025 (in thousands).
| Insights |  | Conferences |  | Consulting |  | Other |  | Total
Balance at December 31, 2024 | $ | 2,453,880 |  |  | $ | 183,920 |  |  | $ | 95,304 |  |  | $ | 197,101 |  |  | $ | 2,930,205 |
Impairment loss (1) | — |  |  | — |  |  | — |  |  | (150,000) |  |  | (150,000) |
Foreign currency translation impact | 6,273 |  |  | 135 |  |  | 1,198 |  |  | 2,112 |  |  | 9,718 |
Balance at September 30, 2025 (1) | $ | 2,460,153 |  |  | $ | 184,055 |  |  | $ | 96,502 |  |  | $ | 49,213 |  |  | $ | 2,789,923 |
Accumulated impairment loss (1) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (150,000) |  |  | $ | (150,000) |
(1)The Company recognized an impairment loss of $150.0 million during the three and nine months ended September 30, 2025.
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, 2025 |  | Customer Relationships |  | Other |  | Total
Gross cost at December 31, 2024 |  | $ | 1,071,917 |  |  | $ | 10,200 |  |  | $ | 1,082,117 |
Intangible assets fully amortized |  | (70,120) |  |  | — |  |  | (70,120) |
Foreign currency translation impact |  | 25,393 |  |  | — |  |  | 25,393 |
Gross cost |  | 1,027,190 |  |  | 10,200 |  |  | 1,037,390 |
Accumulated amortization (1) |  | (672,354) |  |  | (8,003) |  |  | (680,357) |
Balance at September 30, 2025 |  | $ | 354,836 |  |  | $ | 2,197 |  |  | $ | 357,033 |
December 31, 2024 |  | Customer Relationships |  |  |  | Other |  | Total
Gross cost |  | $ | 1,071,917 |  |  |  |  | $ | 10,200 |  |  | $ | 1,082,117 |
Accumulated amortization (1) |  | (665,131) |  |  |  |  | (7,297) |  |  | (672,428) |
Balance at December 31, 2024 |  | $ | 406,786 |  |  |  |  | $ | 2,903 |  |  | $ | 409,689 |
(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 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).
2025 (remaining three months) | $ | 20,086 |
2026 | 80,345 |
2027 | 79,736 |
2028 | 78,265 |
2029 | 78,186 |
2030 | 20,415 |
| $ | 357,033 |

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