ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)			3 Months Ended								12 Months Ended
	Nov. 09, 2020 USD ($)	Jan. 01, 2019	Dec. 31, 2021 USD ($) item	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) item segment	Dec. 31, 2020 USD ($)	Jul. 29, 2021 USD ($)	Jun. 01, 2021 USD ($)	Feb. 19, 2021 USD ($)	Jan. 25, 2021 USD ($)	Jan. 15, 2021	Oct. 31, 2020	Jun. 25, 2020 USD ($)	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			64								64
Number of FM or AM stations owned or operated | item			54								54
Number of HD stations owned or operated | item			8								8
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			$ 19,973,000				$ 473,000				$ 19,973,000	$ 473,000
Carrying value of debt			832,505,000				855,156,000				832,505,000	855,156,000
Accumulated deficit			(766,567,000)				(804,919,000)				(766,567,000)	(804,919,000)
Revenue from Contract with Customer, Including Assessed Tax			130,966,000	$ 111,463,000	$ 107,593,000	$ 91,440,000	113,542,000	$ 91,912,000	$ 76,008,000	$ 94,875,000	441,462,000	376,337,000
Reassessed Estimated Fair Value of Award			28,193,000				25,603,000				28,193,000	25,603,000
Selling, General and Administrative Expense, Total											143,187,000	109,046,000
Amortization of Intangible Assets											3,700,000	3,900,000
Related Party Transaction, Due from (to) Related Party, Total							244,000					244,000
Operating Income (Loss)			22,391,000	$ 34,475,000	$ 37,920,000	$ 23,757,000	34,533,000	$ 3,968,000	$ 20,382,000	$ (27,287,000)	118,543,000	31,596,000
Goodwill			223,402,000				223,402,000				223,402,000	223,402,000
Operating Expenses, Total											322,919,000	344,741,000
Unearned Event Income												5,921,000
Impairment of Long-Lived Assets Held-for-use											0	84,400,000
Operating Lease, Right-of-Use Asset			38,044,000				40,918,000				38,044,000	40,918,000
Operating Lease, Liability			41,300,000								41,300,000
Retained Earnings (Accumulated Deficit), Total			(766,567,000)				(804,919,000)				(766,567,000)	(804,919,000)
INTEREST EXPENSE											65,702,000	74,507,000
Goodwill, impairment loss											0	15,900,000
Radio Broadcasting Licenses			505,148,000				484,066,000				505,148,000	484,066,000
Related party expenses											4,700,000	3,200,000
Due to Other Related Parties, Current			423,000								$ 423,000
Due from related party							(398,000)					(398,000)
Software and web development [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Property, Plant and Equipment, Useful Life											3 years
Property, Plant and Equipment, Estimated Useful Lives											P3Y
Host Community Agreement [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Restricted cash			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
Reach Media
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due to Related Parties			41,000								41,000
Continuing Operations [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Marketing and Advertising Expense											24,700,000	15,500,000
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax											1,800,000	2,100,000
Cost of Goods and Services Sold											1,200,000	1,500,000
Selling, General and Administrative Expense, Total											606,000	570,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees											16,700,000	17,500,000
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	7,222,000
Goodwill, impairment loss											0	0
Goodwill and Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill			223,400,000								$ 223,400,000
Impairment of Long-Lived Assets Held-for-use												$ 84,400,000
Launch support asset
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite Lived Intangible Assets Weighted Average Amortization Period											7 years 1 month 6 days	7 years 4 months 24 days
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period											3 years 3 months 18 days	4 years 6 months
Additional Non-cash Launch Support for Carriage Initiation												$ 1,700,000
Selling, General and Administrative Expense, Total											$ 1,200,000	664,000
Amortization of Intangible Assets											422,000	422,000
Atlanta Market And Indianapolis Broadcasting Licenses And Goodwill [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill and intangible assets impairment												15,900,000
Atlanta Market And Indianapolis Broadcasting Licenses And Goodwill [Member] | Goodwill and Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Radio Broadcasting Licenses			505,200,000								505,200,000
Atlanta, Cincinnati, Dallas, Houston, Indianapolis, Philadelphia, Raleigh, Richmond and St. Louis market radio broadcasting licenses
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Goodwill and intangible assets impairment												68,500,000
Content Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Other Income											7,700,000	4,900,000
Impairment and amortization expense											$ 695,000
Additional amortization expense												0
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
Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Due to Related Parties			$ 4,000				6,000				$ 4,000	6,000
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 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount			4.00%								4.00%
2028 Notes
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross			$ 825,000,000.0								$ 825,000,000.0
Fair value of debt			$ 851,800,000								$ 851,800,000
Debt Instrument, Interest Rate, Stated Percentage			7.375%								7.375%
Face amount of debt																$ 825,000,000
MGM National Harbor Loan
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross							57,900,000					57,900,000
Fair value of debt							64,800,000					64,800,000
Carrying value of debt			$ 0				57,889,000				$ 0	57,889,000
Debt Instrument, Interest Rate, Stated Percentage			7.00%								7.00%
Investment Owned, at Cost																								$ 35,000,000		$ 5,000,000
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	0
7.375% Senior Secured Notes Are Due In April 2022 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	$ 347,000,000.0						3,000,000.0					3,000,000.0
Fair value of debt							$ 2,800,000					$ 2,800,000
Debt Instrument, Interest Rate, Stated Percentage	7.375%		7.375%				7.375%				7.375%	7.375%
Percentage Of Exchange Of Outstanding Notes	99.15%
8.75% Senior Secured Notes due April 2022
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross							$ 347,000,000.0					$ 347,000,000.0
Fair value of debt							$ 338,000,000.0					$ 338,000,000.0
Debt Instrument, Interest Rate, Stated Percentage							8.75%					8.75%
8.75% Senior Secured Notes due December 2022
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Carrying value of debt			$ 0				$ 347,016,000				$ 0	$ 347,016,000
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								$ 7,500,000
Carrying value of debt			$ 7,505,000				0				7,505,000	0
Face amount of debt														$ 7,500,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees											$ 16,900,000	14,600,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			80.00%								80.00%
Urban One [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			100.00%								100.00%
Customer Advances [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Unearned Event Income											$ 5,900,000	0
Unearned Income [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax											3,000,000.0	2,300,000
2017 Credit Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross																							$ 350,000,000
Carrying value of debt			$ 0				317,332,000				$ 0	317,332,000
Debt Instrument, Interest Rate, Stated Percentage			8.75%								8.75%												7.375%
Face amount of debt			$ 350,000,000.0								$ 350,000,000.0
2017 Credit Facility | Senior Secured Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross							317,300,000					317,300,000
Fair value of debt							293,500,000					293,500,000											$ 350,000,000.0
2018 Credit Facility
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross							129,900,000					129,900,000
Fair value of debt							132,500,000					132,500,000
Carrying value of debt			$ 0				129,935,000				0	129,935,000
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
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Other Income											$ 7,700,000	$ 4,900,000