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Intangible Assets - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021
Goodwill [Line Items] |  |  |
Goodwill | $ 2,426,379,000 | $ 2,426,379,000 | $ 2,426,379,000
Change in goodwill | $ 0 |  |
Peter B. Cannell & Co. |  |  |
Goodwill [Line Items] |  |  |
Goodwill, written off related to sale of business Unit |  | $ 9,800,000 |

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