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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021 (in thousands).
| Research |  | Conferences |  | Consulting |  |  | Total
Balance at December 31, 2020 (1) | $ | 2,664,732 |  |  | $ | 184,091 |  |  | $ | 96,724 |  |  |  | $ | 2,945,547 |
Foreign currency translation impact | (1,917) |  |  | (38) |  |  | (92) |  |  |  | (2,047) |
Balance at March 31, 2021 | $ | 2,662,815 |  |  | $ | 184,053 |  |  | $ | 96,632 |  |  |  | $ | 2,943,500 |
(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, 2021 |  | Customer Relationships |  | Software |  | Content |  | Other |  | Total
Gross cost at December 31, 2020 |  | $ | 1,154,210 |  |  | $ | 110,597 |  |  | $ | 3,965 |  |  | $ | 10,614 |  |  | $ | 1,279,386 |
Foreign currency translation impact |  | 948 |  |  | 53 |  |  | — |  |  | — |  |  | 1,001 |
Gross cost |  | 1,155,158 |  |  | 110,650 |  |  | 3,965 |  |  | 10,614 |  |  | 1,280,387 |
Accumulated amortization (1) |  | (406,074) |  |  | (88,933) |  |  | (3,965) |  |  | (3,974) |  |  | (502,946) |
Balance at March 31, 2021 |  | $ | 749,084 |  |  | $ | 21,717 |  |  | $ | — |  |  | $ | 6,640 |  |  | $ | 777,441 |
December 31, 2020 |  | Customer Relationships |  | Software |  | Content |  | Other |  | Total
Gross cost |  | $ | 1,154,210 |  |  | $ | 110,597 |  |  | $ | 3,965 |  |  | $ | 10,614 |  |  | $ | 1,279,386 |
Accumulated amortization (1) |  | (381,776) |  |  | (83,320) |  |  | (3,595) |  |  | (3,697) |  |  | (472,388) |
Balance at December 31, 2020 |  | $ | 772,434 |  |  | $ | 27,277 |  |  | $ | 370 |  |  | $ | 6,917 |  |  | $ | 806,998 |
(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Software—3 to 7 years; Content—2 to 3 years; and Other—2 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).
2021 (remaining nine months) | $ | 75,546 |
2022 | 96,169 |
2023 | 96,154 |
2024 | 90,819 |
2025 | 82,150 |
Thereafter | 336,603 |
| $ | 777,441 |

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