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Goodwill and other intangible assets - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 27, 2021 USD ($) sportLeague | Dec. 31, 2020 USD ($) station licence | Jun. 30, 2021 USD ($) station radioStation
Business Acquisition [Line Items] |  |  |
Number of major professional sports leagues | sportLeague | 4 |  |
Goodwill |  | $ 2,968,693 | $ 2,981,587
Number of television stations | station |  | 1 | 64
Number of radio stations |  | 1 | 2
Indefinite lived intangibles with heightened risk of future impairment |  | $ 67,200 |
Number of FCC license | licence |  | 2 |
Licensing Agreements, TV Station |  |  |
Business Acquisition [Line Items] |  |  |
Individual impairment of headroom (less than) (as a percent) |  | 5.00% |
Licensing Agreements, Radio Station |  |  |
Business Acquisition [Line Items] |  |  |
Individual impairment of headroom (less than) (as a percent) |  | 5.00% |
Locked On Podcast Network LLC |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price of acquisition | $ 13,300 |  |
Base purchase price | 13,800 |  |
Working capital adjustment | 500 |  |
Goodwill | 12,900 |  |
Trade names | Locked On Podcast Network LLC |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 900 |  |

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