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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

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