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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 2021 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2020 (1) | $ | 2,664,732 |  |  | $ | 184,091 |  |  | $ | 96,724 |  |  | $ | 2,945,547 |
Additions due to an acquisition (2) | 11,172 |  |  | — |  |  | — |  |  | 11,172 |
Foreign currency translation impact | (1,398) |  |  | (20) |  |  | 165 |  |  | (1,253) |
Balance at June 30, 2021 (1) | $ | 2,674,506 |  |  | $ | 184,071 |  |  | $ | 96,889 |  |  | $ | 2,955,466 |
(1)The Company does not have any accumulated goodwill impairment losses. (2)The additions were due to the acquisition of Pulse on June 17, 2021. See Note 2 — Acquisition 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).
June 30, 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 |
Additions due to an acquisition (1) |  | 7,980 |  |  | 11,200 |  |  | — |  |  | 280 |  |  | 19,460 |
Intangible assets fully amortized |  | (17,788) |  |  | (60,631) |  |  | (3,965) |  |  | — |  |  | (82,384) |
Foreign currency translation impact |  | 7,895 |  |  | 226 |  |  | — |  |  | — |  |  | 8,121 |
Gross cost |  | 1,152,297 |  |  | 61,392 |  |  | — |  |  | 10,894 |  |  | 1,224,583 |
Accumulated amortization (2) |  | (414,460) |  |  | (30,394) |  |  | — |  |  | (4,250) |  |  | (449,104) |
Balance at June 30, 2021 |  | $ | 737,837 |  |  | $ | 30,998 |  |  | $ | — |  |  | $ | 6,644 |  |  | $ | 775,479 |
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 (2) |  | (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) The additions were due to the acquisition of Pulse on June 17, 2021. See Note 2 — Acquisition for additional information. (2) 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 six months) | $ | 52,600 |
2022 | 101,768 |
2023 | 101,752 |
2024 | 94,540 |
2025 | 84,001 |
Thereafter | 340,818 |
| $ | 775,479 |

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