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Basis of presentation, merger agreement and accounting policies - Narrative (Details) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 18, 2025 USD ($) $ / shares | Sep. 30, 2025 USD ($) Segment Market RadioStation Station $ / shares | Apr. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) $ / 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 |  |
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description |  | Our reportable segment structure has been determined based on our management and internal reporting structure, the nature of products and services we offer, and the financial information that is evaluated regularly by our chief operating decision maker (CODM), who is our Chief Executive Officer. |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] |  | srt:ChiefExecutiveOfficerMember |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 1 |  | $ 1
Allowance for doubtful accounts receivable |  | $ 4,545,000 |  | $ 2,831,000
Gray |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Redemption of noncontrolling interest |  |  | $ 20,800,000 |
Nexstar Media Group, Inc | Merger Agreement |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Termination fee to be paid | $ 120,000 |  |  |
Termination fee to be received | $ 125,000 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 1 |  |  |
Share converted amount, per share | $ / shares | $ 22 |  |  |

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