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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
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 three months ended March 31, 2022 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2021 (1) | $ | 2,670,934 |  |  | $ | 184,021 |  |  | $ | 96,362 |  |  | $ | 2,951,317 |
Foreign currency translation impact | (1,652) |  |  | (27) |  |  | (317) |  |  | (1,996) |
Balance at March 31, 2022 (1) | $ | 2,669,282 |  |  | $ | 183,994 |  |  | $ | 96,045 |  |  | $ | 2,949,321 |
(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).
March 31, 2022 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost at December 31, 2021 |  | $ | 1,096,358 |  |  | $ | 61,216 |  |  |  |  | $ | 10,436 |  |  | $ | 1,168,010 |
Foreign currency translation impact |  | (7,603) |  |  | (112) |  |  |  |  | — |  |  | (7,715) |
Gross cost |  | 1,088,755 |  |  | 61,104 |  |  |  |  | 10,436 |  |  | 1,160,295 |
Accumulated amortization (1) |  | (432,550) |  |  | (38,366) |  |  |  |  | (4,850) |  |  | (475,766) |
Balance at March 31, 2022 |  | $ | 656,205 |  |  | $ | 22,738 |  |  |  |  | $ | 5,586 |  |  | $ | 684,529 |
December 31, 2021 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost |  | $ | 1,096,358 |  |  | $ | 61,216 |  |  |  |  | $ | 10,436 |  |  | $ | 1,168,010 |
Accumulated amortization (1) |  | (413,266) |  |  | (35,727) |  |  |  |  | (4,599) |  |  | (453,592) |
Balance at December 31, 2021 |  | $ | 683,092 |  |  | $ | 25,489 |  |  |  |  | $ | 5,837 |  |  | $ | 714,418 |
(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 to 7 years; and Other—4 to 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).
2022 (remaining nine months) | $ | 75,065 |
2023 | 100,071 |
2024 | 92,890 |
2025 | 82,361 |
2026 | 79,686 |
Thereafter | 254,456 |
| $ | 684,529 |

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