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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes to the carrying amount of goodwill by segment | The table below presents changes to the carrying amount of goodwill by segment during the two-year period ended December 31, 2021 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2019 (1) | $ | 2,651,060 |  |  | $ | 189,641 |  |  | $ | 97,025 |  |  | $ | 2,937,726 |
Foreign currency translation impact | 13,672 |  |  | (5,550) |  |  | (301) |  |  | 7,821 |
Balance at December 31, 2020 (1) | 2,664,732 |  |  | 184,091 |  |  | 96,724 |  |  | 2,945,547 |
Additions due to an acquisition (2) | 11,486 |  |  | — |  |  | — |  |  | 11,486 |
Foreign currency translation impact | (5,284) |  |  | (70) |  |  | (362) |  |  | (5,716) |
Balance at December 31, 2021 (1) | $ | 2,670,934 |  |  | $ | 184,021 |  |  | $ | 96,362 |  |  | $ | 2,951,317 |
(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 — Acquisitions for additional information.
Schedule of changes in finite-lived intangible assets | Finite-lived intangible assets. Changes in finite-lived intangible assets during the two-year period ended December 31, 2021 are presented in the tables below (in thousands).
December 31, 2021 |  | Customer Relationships |  | Technology-related |  | 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 |  |  | — |  |  | 320 |  |  | 19,500 |
Intangible assets fully amortized |  | (61,422) |  |  | (60,685) |  |  | (3,965) |  |  | (498) |  |  | (126,570) |
Foreign currency translation impact |  | (4,410) |  |  | 104 |  |  | — |  |  | — |  |  | (4,306) |
Gross cost |  | 1,096,358 |  |  | 61,216 |  |  | — |  |  | 10,436 |  |  | 1,168,010 |
Accumulated amortization (2) |  | (413,266) |  |  | (35,727) |  |  | — |  |  | (4,599) |  |  | (453,592) |
Balance at December 31, 2021 |  | $ | 683,092 |  |  | $ | 25,489 |  |  | $ | — |  |  | $ | 5,837 |  |  | $ | 714,418 |
December 31, 2020 |  | Customer Relationships |  | Technology-related |  | Content |  | Other |  | Total
Gross cost at December 31, 2019 |  | $ | 1,145,109 |  |  | $ | 111,033 |  |  | $ | 14,140 |  |  | $ | 30,838 |  |  | $ | 1,301,120 |
Intangible assets fully amortized |  | (2,394) |  |  | (787) |  |  | (9,929) |  |  | (20,152) |  |  | (33,262) |
Foreign currency translation impact |  | 11,495 |  |  | 351 |  |  | (246) |  |  | (72) |  |  | 11,528 |
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 — Acquisitions 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; Technology-related—3 to 7 years; Content—2 to 3 years; and Other —2 to 11 years.
Schedule of estimated future amortization expense | The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).
2022 | $ | 100,687 |
2023 | 100,672 |
2024 | 93,479 |
2025 | 82,946 |
2026 | 80,271 |
2027 and thereafter | 256,363 |
| $ | 714,418 |

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