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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Beginning balance |  | $ 1,633,033 | $ 1,380,376
Goodwill acquired |  | 218,745 | 253,096
Goodwill written off related to sale of a business |  | (4,751) |
Purchase accounting adjustments |  | 7,591 | (681)
Foreign exchange translation |  | 12,812 | 242
Ending balance |  | 1,867,430 | 1,633,033
Reportable segments | Cloud Services Total |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 877,872 | 666,988
Goodwill acquired |  | 40,794 | 210,965
Goodwill written off related to sale of a business |  | (4,751) |
Purchase accounting adjustments |  | (2,130) | 177
Foreign exchange translation |  | 12,711 | (258)
Ending balance |  | 924,496 | 877,872
Reportable segments | Fax and Martech |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 397,788 | 366,270
Goodwill acquired |  | 21,738 | 31,672
Goodwill written off related to sale of a business |  | 0 |
Purchase accounting adjustments |  | 0 | 177
Foreign exchange translation |  | 5,945 | (331)
Ending balance |  | 425,471 | 397,788
Reportable segments | Voice, Backup, Security, and CPP |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 480,084 | 300,718
Goodwill acquired |  | 19,056 | 179,293
Goodwill written off related to sale of a business | $ (4,800) | (4,751) |
Purchase accounting adjustments |  | (2,130) | 0
Foreign exchange translation |  | 6,766 | 73
Ending balance |  | 499,025 | 480,084
Reportable segments | Digital Media |  |  |
Goodwill [Line Items] |  |  |
Beginning balance |  | 755,161 | 713,388
Goodwill acquired |  | 177,951 | 42,131
Goodwill written off related to sale of a business |  | 0 |
Purchase accounting adjustments |  | 9,721 | (858)
Foreign exchange translation |  | 101 | 500
Ending balance |  | $ 942,934 | $ 755,161

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