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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