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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2022 (1) | $ | 2,651,193 |  |  | $ | 183,951 |  |  | $ | 95,067 |  |  | $ | 2,930,211 |
Addition due to an acquisition (2) | 4,176 |  |  | — |  |  | — |  |  | 4,176 |
Foreign currency translation impact | (1,267) |  |  | — |  |  | 146 |  |  | (1,121) |
Balance at September 30, 2023 (1) | $ | 2,654,102 |  |  | $ | 183,951 |  |  | $ | 95,213 |  |  | $ | 2,933,266 |
(1)The Company does not have any accumulated goodwill impairment losses. (2)The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
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, 2023 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost at December 31, 2022 |  | $ | 1,060,541 |  |  | $ | 11,200 |  |  |  |  | $ | 10,436 |  |  | $ | 1,082,177 |
Addition due to an acquisition (2) |  | 990 |  |  | — |  |  |  |  | — |  |  | 990 |
Intangible assets fully amortized |  | (987) |  |  | (39) |  |  |  |  | — |  |  | (1,026) |
Foreign currency translation impact |  | 4,970 |  |  | 39 |  |  |  |  | — |  |  | 5,009 |
Gross cost |  | 1,065,514 |  |  | 11,200 |  |  |  |  | 10,436 |  |  | 1,087,150 |
Accumulated amortization (1) |  | (553,279) |  |  | (8,400) |  |  |  |  | (6,356) |  |  | (568,035) |
Balance at September 30, 2023 |  | $ | 512,235 |  |  | $ | 2,800 |  |  |  |  | $ | 4,080 |  |  | $ | 519,115 |
December 31, 2022 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost |  | $ | 1,060,541 |  |  | 11,200 |  |  |  |  | $ | 10,436 |  |  | $ | 1,082,177 |
Accumulated amortization (1) |  | (486,260) |  |  | (5,600) |  |  |  |  | (5,603) |  |  | (497,463) |
Balance at December 31, 2022 |  | $ | 574,281 |  |  | $ | 5,600 |  |  |  |  | $ | 4,833 |  |  | $ | 584,714 |
(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—4 to 11 years. (2)The addition was due to the acquisition of an independent sales agent in September 2023. See Note 2 - Acquisitions and Divestiture for additional information.
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).
2023 (remaining three months) | $ | 22,777 |
2024 | 89,240 |
2025 | 80,573 |
2026 | 77,899 |
2027 | 77,290 |
Thereafter | 171,336 |
| $ | 519,115 |

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