ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Jan. 01, 2019	Sep. 30, 2022 USD ($) item	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) segment item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jun. 01, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 25, 2021 USD ($)	Jan. 15, 2021	Nov. 09, 2020	Oct. 31, 2020	Jun. 25, 2020 USD ($)	Nov. 13, 2019 USD ($)	Dec. 31, 2018	Dec. 20, 2018 USD ($)	Apr. 18, 2017 USD ($)	Nov. 30, 2016 USD ($)	Apr. 21, 2016 USD ($)	Apr. 10, 2015 USD ($)
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Number of independently formatted, revenue producing broadcast stations | item		66				66
Number of FM or AM stations owned or operated | item		55				55
Number of HD stations owned or operated | item		9				9
Number of low power television stations owned or operated | item		2				2
Number of most populous market | item		13				13
Number of reportable segments | segment						4
Restricted cash		$ 19,974,000				$ 19,974,000		$ 19,973,000
Carrying value of debt		775,000,000				775,000,000		832,505,000
Accumulated deficit		(730,951,000)				(730,951,000)		(766,567,000)
Revenue from Contract with Customer, Including Assessed Tax		121,403,000		$ 111,463,000		352,562,000	$ 310,496,000
Payment for launch support						5,000,000.0
Reassessed Estimated Fair Value of Award		27,300,000				27,300,000		28,200,000
Selling, General and Administrative Expense, Total		41,076,000		33,102,000		111,850,000	94,599,000
Operating income (loss)		18,974,000		34,475,000		79,347,000	96,152,000
Goodwill		219,514,000				219,514,000		223,402,000
Operating Expenses, Total		102,429,000		76,988,000		273,215,000	214,344,000
Unearned Event Income						3,338,000	6,700,000
Impairment of Long-Lived Assets Held-for-use		14,450,000				31,383,000	0
Operating Lease, Right-of-Use Asset		34,258,000				34,258,000		38,044,000
Operating Lease, Liability		36,616,000				36,616,000
Retained Earnings (Accumulated Deficit), Total		(730,951,000)				(730,951,000)		(766,567,000)
INTEREST EXPENSE		15,310,000		15,896,000		47,123,000	49,794,000
Radio Broadcasting Licenses		498,532,000				498,532,000		505,148,000
Related party expenses		969,000		1,200,000		2,700,000	2,800,000
Due to Other Related Parties, Current		1,400,000				1,400,000		$ 423,000
Impairment loss, goodwill						4,325,000
Accounting Standards Update 2016-02
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Lease, Practical Expedients, Package [true false]	true
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		536,000		433,000		1,400,000	1,300,000
Cost of Goods and Services Sold		364,000		295,000		937,000	909,000
Selling, General and Administrative Expense, Total		172,000		138,000		504,000	413,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees		4,600,000		4,300,000		12,600,000	12,000,000.0
Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Income Guarantee						1,750,000
Digital Segment [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill		7,222,000				7,222,000
Impairment loss, goodwill						$ 0
Launch support asset
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite Lived Intangible Assets Weighted Average Amortization Period						8 years 1 month 6 days		7 years 1 month 6 days
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period						4 years 1 month 6 days		3 years 3 months 18 days
Additional Non-cash Launch Support for Carriage Initiation						$ 13,800,000
Selling, General and Administrative Expense, Total		153,000		229,000		523,000	687,000
Amortization of Intangible Assets		1,100,000		106,000		2,600,000	317,000
Content Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of finite-lived intangible assets						$ 0	1,400,000
Licensing Agreements [Member] | Minimum
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite-lived intangible asset, useful life						1 year
Licensing Agreements [Member] | Maximum
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite-lived intangible asset, useful life						5 years
Radio Market Reporting Units [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment loss, goodwill		0	$ 4,300,000
Radio Market Reporting Units [Member] | Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment loss, goodwill						$ 4,300,000
Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment charge, indefinite lived intangible asset		$ 14,500,000			$ 12,600,000	27,100,000
Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Reimbursement Expenditure Guarantee						$ 1,000,000.0
Percentage of Performance Bonus						50.00%
Tom Joyner Foundation Inc [Member] | Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Income Guarantee						$ 250,000
Chief Executive Officer
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount		4.00%				4.00%
2028 Notes
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Fair value of debt								$ 851,800,000
MGM National Harbor Loan
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.00%				7.00%
Face amount of debt																		$ 50,000,000.0
Other Income		$ 2,100,000		2,100,000		$ 6,200,000	5,700,000
ABL Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		0				0		0
7.375% Senior Secured Notes due February 2028
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		775,000,000.0				775,000,000.0		825,000,000.0
Fair value of debt		652,900,000				652,900,000
Carrying value of debt		$ 775,000,000				$ 775,000,000		825,000,000
Debt Instrument, Interest Rate, Stated Percentage		7.375%				7.375%
Face amount of debt											$ 825,000,000
8.75% Senior Secured Notes due December 2022
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.75%				8.75%						8.75%	8.75%	8.75%
PPP loan
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Fair value of debt								7,500,000
Carrying value of debt		$ 0				$ 0		7,505,000
Face amount of debt									$ 7,500,000
Other Income		7,600,000	$ 7,600,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees		$ 4,800,000		4,000,000.0		$ 15,300,000	12,300,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		80.00%				80.00%
Customer Advances [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Unearned Event Income						$ 0	0
Unearned Income [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		$ 245,000		279,000		2,300,000	2,900,000
2017 Credit Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross																			$ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage																			7.375%
Face amount of debt		350,000,000.0				350,000,000.0
2018 Credit Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																	9.25%
Face amount of debt		10,000,000				10,000,000									$ 3,600,000			$ 192,000,000.0
ABL Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Face amount of debt																$ 37,500,000
Line of Credit Facility, Maximum Borrowing Capacity										$ 50,000,000						$ 37,500,000					$ 25,000,000
Related Party Agreement Expenditures Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due to Related Parties		2,900,000				2,900,000
Due from related party								41,000
Related Party Agreement Office Facilities Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due to Related Parties		5,000				5,000		$ 4,000
Employment Agreement Award [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Selling, General and Administrative Expense, Total		$ 714,000		$ 1,200,000		$ 2,200,000	$ 2,700,000
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment Owned, at Cost																				$ 35,000,000		$ 5,000,000