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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended 72 Months Ended
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
Subsequent Event [Line Items]                    
Number of reportable segments | segment             3      
Goodwill impairment   $ 616,100,000     $ 616,100,000   $ 616,085,000 $ 595,461,000 $ 0  
Non-cash impairment charge of intangible assets           $ 595,500,000        
Cash and cash equivalents             259,580,000 346,382,000   $ 259,580,000
Total available liquidity amount             $ 685,900,000     $ 685,900,000
Indefinite-lived intangible asset, direct valuation method, period             10 years      
Media representation contracts term             10 years      
Advertising expenses             $ 254,900,000 233,900,000 166,100,000  
Advertising expense, barter costs             230,000,000 $ 210,200,000 138,300,000  
Licensing Agreements                    
Subsequent Event [Line Items]                    
Goodwill impairment             $ 0      
Non-cash impairment charge of intangible assets   304,100,000                
Computer equipment and software                    
Subsequent Event [Line Items]                    
Estimate useful lives             3 years     3 years
Minimum | Buildings and improvements                    
Subsequent Event [Line Items]                    
Estimate useful lives             10 years     10 years
Minimum | Towers, transmitters and studio equipment                    
Subsequent Event [Line Items]                    
Estimate useful lives             5 years     5 years
Minimum | Furniture and other equipment                    
Subsequent Event [Line Items]                    
Estimate useful lives             5 years     5 years
Maximum | Buildings and improvements                    
Subsequent Event [Line Items]                    
Estimate useful lives             39 years     39 years
Maximum | Towers, transmitters and studio equipment                    
Subsequent Event [Line Items]                    
Estimate useful lives             40 years     40 years
Maximum | Furniture and other equipment                    
Subsequent Event [Line Items]                    
Estimate useful lives             7 years     7 years
Subsidiaries | Revolving Credit Facility | Asset-based Revolving Credit Facility due 2027 | Line of Credit                    
Subsequent Event [Line Items]                    
Debt instrument, face amount             $ 450,000,000     $ 450,000,000
Maximum borrowing capacity             450,000,000.0     450,000,000.0
Outstanding borrowings under facility             0     0
Letters of credit outstanding             23,700,000     23,700,000
Borrowing base availability             $ 426,300,000     426,300,000
Licensing Agreements                    
Subsequent Event [Line Items]                    
Goodwill impairment $ 0   $ 0              
Non-cash impairment charge of intangible assets   $ 304,100,000   $ 363,600,000         $ 302,100,000 $ 1,500,000,000