ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)		3 Months Ended								12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Apr. 17, 2019	Dec. 20, 2018	Dec. 04, 2018	Apr. 18, 2017	Nov. 30, 2016	Apr. 10, 2015
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		$ 0				$ 2,000,000				$ 0	$ 2,000,000
Selling, General and Administrative Expense, Total										152,550,000	$ 149,710,000
Debt Instrument, Interest Rate, Stated Percentage						9.25%					9.25%
Amortization of Intangible Assets										10,900,000	$ 26,700,000
Related Party Transaction, Due from (to) Related Party, Total		24,000				$ 208,000				$ 24,000	208,000
Related Party Transaction, Terms and Manner of Settlement										Distributions from operating income or operating revenues, depending upon the year, are in the following order until the funds are depleted: up to $250,000 to the Foundation, reimbursement of Reach's expenditures, up to $1.0 million fee to Reach, a performance bonus of up to 50% of remaining operating income to Reach, with the balance remaining with the Foundation
Revenue from Contract with Customer, Including Assessed Tax		105,854,000	$ 111,055,000	$ 121,571,000	$ 98,449,000	113,541,000	$ 110,730,000	$ 115,206,000	$ 99,621,000	$ 436,929,000	439,098,000
Operating Income (Loss)		12,062,000	$ 31,117,000	$ 29,121,000	$ 14,796,000	9,411,000	32,101,000	$ 24,813,000	$ 7,315,000	87,096,000	73,640,000
Operating Expenses, Total										349,833,000	365,458,000
Unearned Event Income										6,645,000	3,864,000
Derivative Instruments Credit Adjustment Liability							$ 6,600,000
Impairment of Long-Lived Assets Held-for-use										10,600,000	21,256,000
Goodwill		239,772,000				245,572,000				239,772,000	245,572,000
Indefinite-Lived License Agreements		582,697,000				600,134,000				582,697,000	600,134,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		1,000,000				14,700,000				4,800,000	3,900,000
Long-term Debt.		889,873,000				929,901,000				$ 889,873,000	929,901,000
long-term deferred tax liabilities						3,400,000					3,400,000
Related Party Transaction Revenue Terms and Manner of Settlement										For years 2020 through 2022, $250,000 to the Foundation is guaranteed. Reach Media's earnings for the Fantastic Voyage(R) may not exceed $1.7 million in 2018 and 2019, nor $1.75 million in 2020 and thereafter.
Operating Lease, Right-of-Use Asset		44,922,000								$ 44,922,000
Operating Lease, Liability		49,474,000								49,474,000
Cumulative Effect on Retained Earnings, Net of Tax											3,600,000
Restatement of Prior Year Income, Net of Tax											200,000
Accounting Standards Update 2016-02 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Lease, Practical Expedients, Package [true false]	true
Operating Lease, Right-of-Use Asset	$ 49,800,000
Operating Lease, Liability	54,100,000
Deferred Rent Credit	$ 4,300,000
Cumulative Effect on Retained Earnings, Net of Tax										5,800,000
Continuing Operations [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Marketing and Advertising Expense										24,800,000	19,400,000
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Cost of Goods and Services Sold										1,500,000	1,300,000
Selling, General and Administrative Expense, Total										596,000	161,000
Revenue from Contract with Customer, Including Assessed Tax										2,100,000	1,500,000
Adjustment in Revenue										2,000,000	2,000,000
Marketing Services Fee Receivable		2,000,000								2,000,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees										21,400,000	25,500,000
Digital Segment [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use										5,800,000
Goodwill		7,222,000				13,022,000				7,222,000	13,022,000
Launch Support Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Additional Non-cash Launch Support for Carriage Initiation											3,700,000
Selling, General and Administrative Expense, Total										$ 605,000	$ 3,000
Finite Lived Intangible Assets Weighted Average Amortization Period										7 years 9 months 18 days	7 years 9 months 18 days
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period										5 years 1 month 6 days	6 years 1 month 6 days
Amortization of Intangible Assets										$ 422,000	$ 422,000
Detroit Radio Broadcasting licenses And Goodwill [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use											21,300,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)										4,800,000
Content Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Amortization of Intangible Assets										4,900,000	1,600,000
Goodwill and Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use										10,600,000	21,300,000
Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Due from (to) Related Party, Total		$ 32,000				34,000				$ 32,000	34,000
Chief Executive Officer [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount		4.00%								4.00%
9.25% Senior Subordinated Notes due February 2020 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross						2,000,000					2,000,000
Debt Instrument, Fair Value Disclosure						2,000,000					2,000,000
Debt Instrument, Interest Rate, Stated Percentage		9.25%								9.25%
Long-term Debt.						2,037,000					2,037,000
Senior Subordinated Notes due March 2022 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		$ 350,000,000				350,000,000				$ 350,000,000	350,000,000
Debt Instrument, Fair Value Disclosure		$ 344,800,000				332,500,000				$ 344,800,000	332,500,000
Debt Instrument, Interest Rate, Stated Percentage		7.375%								7.375%
Senior Secured Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		$ 320,600,000				323,900,000				$ 320,600,000	323,900,000
Debt Instrument, Fair Value Disclosure		309,100,000				305,800,000				309,100,000	305,800,000
Debt Instrument, Face Amount															$ 350,000,000
MGM National Harbor Loan [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		52,100,000				50,100,000				52,100,000	50,100,000
Debt Instrument, Fair Value Disclosure		$ 58,400,000				56,100,000				$ 58,400,000	56,100,000
Debt Instrument, Interest Rate, Stated Percentage		7.00%								7.00%
Debt Instrument, Face Amount													$ 50,000,000
Long-term Debt.		$ 52,099,000				$ 50,066,000				$ 52,099,000	50,066,000			$ 50,000,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees										$ 14,100,000	13,600,000
Reach Media Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		80.00%								80.00%
Reach Media Inc [Member] | Fantastic Voyage [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax										$ 10,200,000	9,300,000
Operating Income (Loss)										1,700,000	1,700,000
Operating Expenses, Total										8,500,000	$ 7,600,000
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]
Revenue from Contract with Customer, Including Assessed Tax										2,700,000	$ 2,100,000
Unearned Event Income										3,900,000	4,100,000
2017 Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		$ 320,600,000								320,600,000					$ 350,000,000
Long-term Debt.		320,629,000				$ 323,926,000				320,629,000	323,926,000
2018 Credit Facility [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross		167,100,000				192,000,000				167,100,000	192,000,000			$ 192,000,000
Debt Instrument, Fair Value Disclosure		170,500,000				195,900,000				170,500,000	195,900,000
Debt Instrument, Face Amount													$ 192,000,000
Long-term Debt.		$ 167,145,000				192,000,000				$ 167,145,000	192,000,000
Staffing And Recruiting Services [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Amounts of Transaction											31,000
Comcast Note [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross						11,900,000					11,900,000
Debt Instrument, Fair Value Disclosure						11,900,000					11,900,000
Debt Instrument, Interest Rate, Stated Percentage		10.47%								10.47%
Debt Instrument, Face Amount						$ 11,900,000					11,900,000	$ 11,900,000
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment Owned, at Cost																$ 35,000,000	$ 5,000,000
Other Income										$ 6,900,000	$ 7,000,000