ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($)	3 Months Ended													6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	[1]	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017	[2]	Mar. 31, 2017	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 20, 2018	Dec. 04, 2018	Apr. 28, 2017	Apr. 18, 2017	Nov. 30, 2016	Apr. 10, 2015
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	$ 2,000,000															$ 2,000,000
Cost of Goods and Services Sold																$ 125,364,000	$ 130,417,000
Debt Instrument, Interest Rate, Stated Percentage	9.25%															9.25%
Amortization of Intangible Assets																$ 26,700,000	26,900,000
Related Party Transaction, Due from (to) Related Party, Total	$ 208,000						$ 1,100,000									$ 208,000	1,100,000
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.
Revenues	113,541,000	[1]	$ 110,730,000	$ 115,206,000	$ 99,621,000		109,036,000	[2]	$ 112,078,000	[2]	$ 117,638,000		$ 101,289,000			$ 439,098,000	440,041,000
Operating Income (Loss)	9,411,000	[1]	32,101,000	$ 24,813,000	$ 7,315,000		20,627,000	[2]	$ 3,531,000		$ 12,108,000		$ 16,453,000			73,640,000	52,719,000
Operating Expenses, Total																365,458,000	387,322,000
Unearned Event Income	3,864,000						4,117,000									3,864,000	4,117,000
Derivative Instruments Credit Adjustment Liability			$ 6,600,000
Impairment of Long-Lived Assets Held-for-use																21,256,000	29,148,000
Goodwill	245,572,000						262,894,000									245,572,000	262,894,000			$ 4,600,000
Indefinite-Lived License Agreements	600,134,000						614,535,000									600,134,000	614,535,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)														$ 12,700,000	$ 16,400,000	3,900,000
Long-term Debt	929,901,000						984,247,000									$ 929,901,000	984,247,000
Reduction Of Amortization Expense																	8,900,000
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® may not exceed $1.7 million in 2018 and 2019, nor $1.75 million in 2020 and thereafter.
Customer Advances [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenues																$ 2,100,000
Credit Facility 2017 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	323,900,000															323,900,000					$ 350,000,000
Long-term Debt	323,926,000						347,375,000									323,926,000	347,375,000
Credit Facility 2018 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	192,000,000															192,000,000			$ 192,000,000
Debt Instrument, Fair Value Disclosure	195,900,000															195,900,000
Debt Instrument, Face Amount																		$ 192,000,000
Long-term Debt	192,000,000						0									192,000,000	0
Staffing And Recruiting Services [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Amounts of Transaction																31,000	425,000
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
MGM National Harbor [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Investment Owned, at Cost																						$ 35,000,000	$ 5,000,000
Other Income																7,000,000	6,100,000
Continuing Operations [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Marketing and Advertising Expense																19,400,000	22,700,000
Barter Transactions [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	161,000						162,000									1,500,000	2,300,000
Cost of Goods and Services Sold																1,300,000	2,100,000
Adjustment in Revenue																2,700,000
Marketing Services Fee Receivable	2,700,000															2,700,000
Radio broadcasting and Reach Media segments [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees																25,500,000	$ 25,200,000
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Lease, Right-of-Use Asset	50,000,000															50,000,000
Operating Lease, Liability	60,000,000															60,000,000
Minimum [Member] | Accounting Standards Update 2016-02 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Operating Lease, Right-of-Use Asset	39,000,000															39,000,000
Operating Lease, Liability	46,000,000															$ 46,000,000
Launch Support Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Finite Lived Intangible Assets Weighted Average Amortization Period																7 years 9 months 18 days	9 years 6 months
Finite Lived Intangible Assets Remaining Weighted Average Amortization Period																6 years 1 month 6 days	7 years 1 month 6 days
Amortization of Intangible Assets							432,000									$ 422,000
Payment Of Launch Support																3,700,000	$ 1,800,000
Columbus And Houston Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)																	29,100,000
Detroit Radio Broadcasting licenses And Goodwill [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)																21,300,000
Content Assets [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Amortization of Intangible Assets																1,600,000	0
Goodwill and Radio Broadcasting Licenses [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Impairment of Long-Lived Assets Held-for-use																21,300,000	29,100,000
Tom Joyner Foundation Inc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Due from (to) Related Party, Total	34,000						26,000									34,000	26,000
Tom Joyner Limited [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Related Party Transaction, Due from (to) Related Party, Total	$ 2,000						4,000									$ 2,000	4,000
Chief Executive Officer [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Percentage Of Award Amount	4.00%															4.00%
Senior Subordinated Notes due February 2020 [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	$ 2,000,000						2,000,000									$ 2,000,000	2,000,000
Debt Instrument, Fair Value Disclosure	$ 275,000,000						257,800,000									$ 275,000,000	257,800,000
Debt Instrument, Interest Rate, Stated Percentage	9.25%															9.25%
Long-term Debt	$ 2,037,000						275,000,000									$ 2,037,000	275,000,000
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	$ 332,500,000						348,300,000									$ 332,500,000	348,300,000
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							347,400,000										347,400,000
Debt Instrument, Fair Value Disclosure	$ 305,800,000						340,400,000									$ 305,800,000	340,400,000
Debt Instrument, Face Amount							350,000,000										350,000,000
MGM National Harbor Loan [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Long-term Debt, Gross	50,100,000															50,100,000
Debt Instrument, Fair Value Disclosure	$ 56,100,000															$ 56,100,000
Debt Instrument, Interest Rate, Stated Percentage	7.00%															7.00%
Debt Instrument, Face Amount																		$ 50,000,000
Long-term Debt	$ 50,066,000						$ 0									$ 50,066,000	0		$ 50,000,000
Tv One Llc [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Sales Commissions and Fees																$ 13,600,000	13,900,000
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]
Revenues																$ 9,300,000	9,000,000
Operating Income (Loss)																1,700,000	1,700,000
Operating Expenses, Total																$ 7,600,000	$ 7,300,000
Urban One [Member]
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent							100.00%										100.00%

[1] The net (loss) income from continuing operations for the quarters ended March 31, 2018 and December 31, 2018, includes approximately $6.6 million and $14.7 million, respectively of impairment charges. The net income for the quarter ended December 31, 2018 includes a benefit from income taxes of approximately $127.8 million.

[2] The net income (loss) from continuing operations for the quarters ended June 30, 2017 and September 30, 2017, includes approximately $12.7 million and $16.4 million, respectively of impairment charges. The net income from continuing operations for the quarter ended June 30, 2017 includes approximately $14.4 million of gain on sale-leaseback. The net income for the quarter ended December 31, 2017 includes a benefit from income taxes of approximately $117.2 million.