SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)								3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Apr. 21, 2023 USD ($)	Oct. 01, 2022 USD ($)	Sep. 30, 2022 USD ($)	Oct. 01, 2021 USD ($)	Jan. 01, 2021 USD ($)	Jan. 01, 2019	Nov. 30, 2016 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) item segment	Dec. 31, 2021 USD ($)	Mar. 08, 2023	Aug. 01, 2021	Jul. 29, 2021 USD ($)	Jun. 01, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 25, 2021 USD ($)	Nov. 09, 2020	Oct. 31, 2020	Jun. 25, 2020 USD ($)	Nov. 13, 2019 USD ($)	Dec. 31, 2018	Dec. 20, 2018 USD ($)	Apr. 18, 2017 USD ($)	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
Number of FM or AM stations owned or operated | item																				55
Number of HD stations owned or operated | item																				9
Number of low power television stations owned or operated | item																				2
Number of most populous market | item																				13
Number of reportable segments | segment																				4
Restricted cash												$ 19,973,000								$ 19,975,000	$ 19,973,000
Carrying value of debt												832,505,000								750,000,000	832,505,000
Accumulated deficit			$ (733,844,000)						$ (733,844,000)	$ (737,251,000)	$ (753,824,000)	(770,317,000)	$ (775,603,000)	$ (789,488,000)	$ (807,101,000)	$ (737,251,000)	$ (789,488,000)	$ (733,844,000)	$ (775,603,000)	(732,988,000)	(770,317,000)
Revenue from Contract with Customer, Including Assessed Tax									121,250,000	118,657,000	112,131,000	130,475,000	111,234,000	107,365,000	91,211,000	230,788,000	198,576,000	352,038,000	309,810,000	484,604,000	440,285,000
Reassessed Estimated Fair Value of Award												28,200,000								26,300,000	28,200,000
Selling, General and Administrative Expense, Total									40,923,000	35,193,000	35,210,000	48,097,000	32,873,000	31,282,000	29,758,000	70,403,000	61,040,000	111,326,000	93,913,000	160,230,000	142,010,000
Amortization of Intangible Assets																				3,700,000	3,700,000
Exercisable period of put rights							30 days
Operating income (loss)									17,974,000	25,863,000	36,538,000	20,287,000	34,475,000	37,920,000	23,757,000	62,401,000		80,375,000		94,687,000	116,439,000
Goodwill												223,402,000								216,599,000	223,402,000
Operating Expenses, Total									103,276,000	92,794,000	75,593,000	110,188,000	76,759,000	69,445,000	67,454,000	168,387,000	136,899,000	271,663,000	213,658,000	389,917,000	323,846,000
Unearned Event Income					$ 5,921,000															5,708,000
Impairment of Long-Lived Assets Held-for-use									15,450,000	14,905,000		2,104,000				14,905,000		30,355,000		40,683,000	2,104,000
Operating Lease, Right-of-Use Asset			34,131,000						34,131,000	34,035,000	36,201,000	37,956,000	39,481,000	42,140,000	40,372,000	34,035,000	42,140,000	34,131,000	39,481,000	31,879,000	37,956,000
Operating Lease, Liability																				34,235,000
INTEREST EXPENSE																				61,751,000	65,702,000
Goodwill and intangible assets impairment																14,905,000		30,355,000		40,683,000	2,104,000
Radio broadcasting licenses			495,832,000						$ 495,832,000	487,640,000	$ 501,420,000	501,420,000	$ 503,524,000	$ 503,524,000	$ 482,442,000	487,640,000	$ 503,524,000	$ 495,832,000	$ 503,524,000	488,419,000	501,420,000
Related party expenses																				3,800,000	4,700,000
Due to Other Related Parties, Current												423,000								1,500,000	423,000
Impairment loss, goodwill																				7,240,000	0
Other income, net																				16,083,000	8,134,000
Atlanta and Philadelphia Markets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment loss, goodwill																				$ 7,200,000
Software and web development [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Property, Plant and Equipment, Useful Life																				3 years
Host Community Agreement [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Restricted cash												19,500,000								$ 19,500,000	19,500,000
Host Community Agreement [Member] | RVA Entertainment Holdings LLC [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Upfront Payment																								$ 26,000,000
Accounting Standards Update 2016-02
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Lease, Practical Expedients, Package [true false]						true
Continuing Operations [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Marketing and Advertising Expense																				31,300,000	24,700,000
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax																				2,000,000.0	1,800,000
Cost of Goods and Services Sold																				1,300,000	1,200,000
Selling, General and Administrative Expense, Total																				679,000	606,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees																				18,400,000	16,700,000
Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Income Guarantee																				1,750,000
Fantastic Voyage [Member] | Reach Media
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax																					7,000,000.0
Operating income (loss)																					400,000
Operating Expenses, Total																					6,600,000
Digital Segment [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill												7,222,000								7,222,000	7,222,000
Impairment loss, goodwill																				$ 0	$ 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																				3 years 9 months 18 days	3 years 3 months 18 days
Payment for launch support																				$ 9,300,000	$ 0
Additional Non-cash Launch Support for Carriage Initiation																				9,500,000
Amortization of Intangible Assets																				$ 4,400,000	1,600,000
Content Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of finite-lived intangible assets																					$ 695,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]																					Programming And Technical Including Stock-Based Compensation
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 Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Radio broadcasting licenses																				$ 488,400,000
Impairment charge, indefinite lived intangible asset		$ 7,400,000	$ 15,500,000	$ 2,100,000						3,700,000						$ 10,600,000				33,443,000	$ 2,104,000
Radio Broadcasting Licenses [Member] | Atlanta Cincinnati Dallas Houston Indianapolis Philadelphia and Raleigh Market Radio Broadcasting Licenses [Member] | Atlanta, Dallas, Houston, Indianapolis, Raleigh and Richmond Market [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill and intangible assets impairment																				33,500,000
Goodwill and Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill and intangible assets impairment																				40,700,000	2,100,000
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%
MGM National Harbor Loan
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																				7.00%
Face amount of debt																																	$ 50,000,000.0
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												825,000,000.0								750,000,000.0	825,000,000.0
Fair value of debt												851,800,000								646,900,000	851,800,000
Carrying value of debt												825,000,000								$ 750,000,000	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%
PPP loan
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Fair value of debt												7,500,000									7,500,000
Carrying value of debt												7,505,000								$ 0	7,505,000
Face amount of debt																									$ 7,500,000
Other Income										$ 7,600,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees																				$ 20,100,000	16,900,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent																				80.00%
Urban One [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent																				100.00%
Customer Advances [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax																				$ 2,500,000	3,000,000.0
Unearned Income [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax																				0	5,900,000
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
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										$ 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] | Reach Media
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due to Other Related Parties, Current												$ 41,000									41,000
Related Party Agreement Office Facilities Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due from related party																				2,300,000
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment Owned, at Cost							$ 35,000,000																													$ 5,000,000
Percentage of ownership of equity interest excluding interest in entity																						100.00%
Other income, net								$ 8,800,000												$ 8,800,000	$ 7,700,000
MGM National Harbor [Member] | Subsequent events
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Other income, net								$ 8,800,000
Proceeds from sale of available for sale debt securities	$ 136,800,000