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Basis of presentation, merger agreement and accounting policies - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 02, 2023 USD ($) shares | Jun. 01, 2023 shares | May 22, 2023 USD ($) | Jun. 30, 2023 USD ($) market shares | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) segment station radioStation market shares | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) shares
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  | 1 |  |
Number of reportable segments | segment |  |  |  |  |  | 1 |  |
Number of television stations | station |  |  |  |  |  | 64 |  |
Number of radio stations | radioStation |  |  |  |  |  | 2 |  |
Number of markets in which entity operates | market |  |  |  | 51 |  | 51 |  |
Allowance for doubtful accounts receivable |  |  |  | $ 4,249,000 |  | $ 4,249,000 |  | $ 3,697,000
Asset impairment and other |  |  |  | $ 3,359,000 | $ (105,000) | $ 3,359,000 | $ (163,000) |
Shares repurchased in period (in shares) | shares |  |  |  | 122,978,320 |  | 122,978,320 |  | 100,970,426
Shares repurchased in period |  |  |  | $ 5,314,047,000 |  | $ 5,314,047,000 |  | $ 5,053,160,000
Accelerated Share Repurchase Program (ASR) |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Share repurchase program | $ 300,000,000 |  |  |  |  |  |  |
Shares repurchased in period (in shares) | shares | 15,200,000 |  |  |  |  |  |  |
Percent repurchased | 80.00% |  |  |  |  |  |  |
Shares repurchased in period | $ 240,000,000 |  |  |  |  |  |  |
Teton Parent Corp |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Termination fee |  |  | $ 136,000,000 |  |  |  |  |
Termination fee paid in shares (in shares) | shares |  | 8,600,000 |  |  |  |  |  |
Teton Parent Corp | Advisor |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Termination fee |  |  | $ 9,900,000 |  |  |  |  |

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