ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)		3 Months Ended		12 Months Ended
	Jan. 01, 2019	Mar. 31, 2022 USD ($) item segment	Mar. 31, 2021 USD ($)	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		64
Number of FM or AM stations owned or operated | item		54
Number of HD stations owned or operated | item		8
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		$ 19,973,000
Carrying value of debt		832,505,000		832,505,000
Accumulated deficit		(750,198,000)		(766,567,000)
Revenue from Contract with Customer, Including Assessed Tax		112,349,000	$ 91,440,000
Reassessed Estimated Fair Value of Award		28,772,000		28,193,000
Selling, General and Administrative Expense, Total		35,428,000	29,987,000
Due to Related Parties		2,000		4,000
Operating Income (Loss)		36,538,000	23,757,000
Goodwill		223,402,000		223,402,000
Operating Expenses, Total		75,811,000	67,683,000
Unearned Event Income			5,735,000
Operating Lease, Right-of-Use Asset		36,302,000		38,044,000
Operating Lease, Liability		39,309,000
Retained Earnings (Accumulated Deficit), Total		(750,198,000)		(766,567,000)
INTEREST EXPENSE		15,927,000	18,045,000
Goodwill, impairment loss		0
Radio Broadcasting Licenses		505,148,000		505,148,000
Related party expenses		940,000	1,000,000.0
Due to Other Related Parties, Current		298,000		423,000
Due from related party		148,000		$ 41,000
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		430,000	449,000
Cost of Goods and Services Sold		265,000	311,000
Selling, General and Administrative Expense, Total		165,000	138,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees		3,700,000	3,500,000
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
Goodwill, impairment loss		$ 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 7 months 6 days		3 years 3 months 18 days
Additional Non-cash Launch Support for Carriage Initiation		$ 18,800,000
Selling, General and Administrative Expense, Total		218,000	229,000
Amortization of Intangible Assets		$ 434,000	105,000
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
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 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount		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%
Face amount of debt														$ 50,000,000.0
Other Income		$ 2,000,000.0	1,700,000
ABL Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		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		825,000,000.0
Fair value of debt		825,000,000.0
Carrying value of debt		$ 825,000,000		825,000,000
Debt Instrument, Interest Rate, Stated Percentage		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%
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		$ 7,505,000
Face amount of debt					$ 7,500,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees		$ 5,100,000	3,800,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		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		1,500,000	2,000,000.0
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
Employment Agreement Award [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Selling, General and Administrative Expense, Total		$ 579,000	$ 597,000
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment Owned, at Cost																$ 35,000,000		$ 5,000,000