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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | May 01, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) trust segment | Dec. 31, 2020 USD ($) | Apr. 30, 2019 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 6,016,930,000 | $ 5,738,868,000 | $ 6,016,930,000 |
Number of Reportable Segments | segment |  |  |  |  |  |  | 3 |  |
Allowable interest deductions, increase (decrease) during period, CARES Act |  |  |  |  |  |  |  | 179,400,000 |
Employer social security payments, deferred payment, CARES Act |  |  |  |  |  |  |  | 29,300,000 |
Refundable payroll tax credit, CARES Act |  |  |  |  |  |  | $ 12,400,000 |  |
Refundable payroll tax credit received, CARES Act |  |  |  |  |  |  | 3,800,000 | 700,000 |
Cash and cash equivalents |  |  |  | $ 63,142,000 |  | 720,662,000 | $ 352,129,000 | 720,662,000 |
Number of trusts of which the Company is the beneficiary | trust |  |  |  |  |  |  | 2 |  |
Indefinite-lived intangibles - licenses |  |  |  | 2,281,720,000 |  | 1,770,345,000 | $ 1,778,045,000 | 1,770,345,000 |
Goodwill |  |  |  | 3,323,365,000 | $ 3,325,622,000 | 2,145,935,000 | 2,313,581,000 | 2,145,935,000 |
Impairment charges |  | $ 0 |  | 91,382,000 | 0 |  | 57,734,000 | 1,738,752,000 |
Goodwill impairment |  | $ 0 | $ 1,200,000,000 |  |  | 0 |  | 1,224,374,000 |
Noncash impairment charge of other investments |  |  |  | 8,300,000 | 21,000,000 |  | $ 8,700,000 | 900,000 |
Media representation contracts term |  |  |  |  |  |  | 10 years |  |
Advertising expenses |  |  |  | 59,600,000 | 126,000,000 |  | $ 166,100,000 | 167,200,000 |
Advertising expense, barter costs |  |  |  | 46,000,000 | $ 105,000,000 |  | $ 130,100,000 | 133,000,000 |
Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Refundable payroll tax credit received, CARES Act | $ 7,900,000 |  |  |  |  |  |  |  |
Computer equipment and software |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 3 years |  |
Minimum | Buildings and improvements |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 10 years |  |
Minimum | Towers, transmitters and studio equipment |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 5 years |  |
Minimum | Furniture and other equipment |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 5 years |  |
Maximum | Buildings and improvements |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 39 years |  |
Maximum | Towers, transmitters and studio equipment |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 40 years |  |
Maximum | Furniture and other equipment |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Estimate useful lives |  |  |  |  |  |  | 7 years |  |
Licensing Agreements |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Indefinite-lived intangibles - licenses |  |  |  | 2,281,720,000 |  |  |  |  |
Impairment of intangible assets |  |  | $ 502,700,000 | 91,400,000 |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 4,600,762,000 | $ 4,320,602,000 | 4,600,762,000 |
Secured Debt | 6.375% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 800,000,000 |  | $ 800,000,000 | 800,000,000 | $ 800,000,000 |
Debt instrument, face amount |  |  |  | $ 800,000,000 |  |  | $ 800,000,000 |  |
Interest Rate |  |  |  | 6.375% |  |  | 6.375% |  |
Stated interest rate (as a percent) |  |  |  | 6.375% |  |  | 6.375% |  |
iHeart Communications, Inc. |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 5,800,000,000 |  |  |  |  | $ 16,000,000,000
iHeart Communications, Inc. | Secured Debt |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | 3,500,000,000 |  |  |  |  |
iHeart Communications, Inc. | Secured Debt | 8.375% Senior Unsecured Notes due 2027 |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,450,000,000 |  |  |  |  |
Interest Rate |  |  |  | 8.375% |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 8.375% |  |  |  |  |
iHeart Communications, Inc. | Secured Debt | 6.375% Senior Secured Notes due 2026 |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 800,000,000 |  |  |  |  |
Interest Rate |  |  |  | 6.375% |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 6.375% |  |  |  |  |
iHeart Communications, Inc. | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 450,000,000 |  |  |  |  |

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