LONG-TERM DEBT (Details Textual) - USD ($)		1 Months Ended				3 Months Ended							12 Months Ended
	Feb. 10, 2014	Dec. 19, 2018	Apr. 18, 2017	Apr. 21, 2016	Apr. 17, 2015	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 20, 2018	Dec. 04, 2018
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount						$ 801,000							$ 801,000
Long-term Debt, Gross						$ 2,000,000							$ 2,000,000
Debt Instrument, Interest Rate, Stated Percentage						9.25%							9.25%
Gains (Losses) on Extinguishment of Debt, Total													$ (1,809,000)	$ (5,219,000)
Debt Instrument, Interest Rate Terms													The 2018 Credit Facility contains customary representations and warranties and events of default, affirmative and negative covenants (in each case, subject to materiality exceptions and qualifications). The 2018 Credit Facility also contains certain financial covenants, including a maintenance covenant requiring the Company's total gross leverage ratio to be not greater than 8.0 to 1.00 in 2019, 7.5 to 1.00 in 2020, 7.25 to 1.00 in 2021 and 6.75 to 1.00 in 2022.
Interest Expense, Total													$ 76,667,000	79,420,000
Debt Instrument Additional Interest Payment Term On Prepayment			Beginning with the interest payment date occurring in June 2017 and ending in March 2023, the Company will be required to repay principal, to the extent then outstanding, equal to 1∕4 of 1% of the aggregate initial principal amount of all term loans incurred on the effective date of the 2017 Credit Facility.
Long-term Debt						$ 929,901,000				$ 984,247,000	$ 984,247,000		$ 929,901,000	984,247,000
Long-term Debt, Maturity Date						Dec. 31, 2022							Dec. 31, 2022
Repayments of Lines of Credit						$ 7,000,000
Line of Credit Facility, Expiration Date						Oct. 17, 2019
Comcast Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 11,900,000							$ 11,900,000
Long-term Debt, Gross						$ 11,900,000							$ 11,900,000
Debt Instrument, Interest Rate, Stated Percentage						10.47%							10.47%
2022 Notes
Debt Instrument [Line Items]
Long-term Debt, Gross					$ 350,000,000
Debt Instrument, Description					an original issue price of 100.0% plus accrued interest
9.25% Senior Subordinated Notes due February 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross						$ 2,000,000				2,000,000	2,000,000		$ 2,000,000	2,000,000
Debt Instrument, Interest Rate, Stated Percentage						9.25%							9.25%
Gains (Losses) on Extinguishment of Debt, Total						$ 2,800,000
Debt Instrument, Repurchase Amount						$ 243,000,000							$ 243,000,000
Debt Instrument, Redemption Price, Percentage						100.88%
Long-term Debt						$ 2,037,000				275,000,000	275,000,000		$ 2,037,000	275,000,000
Write off of Deferred Debt Issuance Cost						649,000
Debt Instrument, Redemption Period, Start Date													Feb. 15, 2019
Premium Paid to the Bondholders						2,100,000
9.25% Senior Subordinated Notes due February 2020 [Member] | Private Offering [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 335,000,000
Debt Instrument, Periodic Payment	$ 15,500,000
7.375% Senior Subordinated Notes due April 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description					The 2022 Notes were offered at an original issue price of 100.0% plus accrued interest from April 17, 2015, and will mature on April 15, 2022. Interest on the 2022
MGM National Harbor Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 50,000,000
Long-term Debt, Gross						$ 50,100,000							$ 50,100,000
Debt Instrument, Interest Rate, Stated Percentage						7.00%							7.00%
Long-term Debt						$ 50,066,000				0	0		$ 50,066,000	0		$ 50,000,000
Debt Instrument, Unamortized Discount (Premium), Net						1,000,000							$ 1,000,000
Long Term Debt Percentage Paid In Kind													4.00%
Debt Issuance Costs, Net						1,700,000							$ 1,700,000
2015 Credit Facility [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt, Total														$ 875,000
Debt Instrument, Interest Rate Terms					At the Company’s election, the interest rate on borrowings under the 2015 Credit Facility was based on either (i) the then applicable base rate plus 3.5% (as defined in the 2015 Credit Facility) as, for any day, a rate per annum (rounded upward, if necessary, to the next 1/100th of 1%) equal to the greater of (a) the prime rate published in the Wall Street Journal, (b) a rate of 1/2 of 1% in excess rate of the overnight Federal Funds Rate at any given time, and (c) the one-month LIBOR commencing on such day plus 1.00%), or (ii) the then applicable LIBOR rate plus 4.5% (as defined in the 2015 Credit Facility). The average interest rate was approximately 5.32% for 2017. Quarterly installments of 0.25%, or $875,000, of the principal balance on the term were are payable on the last day of each March, June, September and December beginning on September 30, 2015. During the year ended December 31, 2017, the Company repaid $875,000 under the 2015 Credit Facility. The 2015 Credit Facility was terminated on April 18, 2017.
Asset Backed Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 25,000,000
Percentage Borrowing Of Eligible Accounts				(85.00%)
Proceeds from Lines of Credit						7,000,000
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Covenant Compliance Description For Maintaining Interest Coverage Ratio														maintaining an interest coverage ratio of no less than:1.25 to 1.00 on June 30, 2017 and the last day of each fiscal quarter thereafter.
Covenant Compliance Description For Maintaining Total Leverage Ratio														maintaining a senior leverage ratio of no greater than:5.85 to 1.00 on June 30, 2017 and the last day of each fiscal quarter thereafter.
Repayments of Long-term Debt, Total		$ 20,000,000											23,400,000	$ 2,600,000
Long-term Debt, Gross			$ 350,000,000			323,900,000							323,900,000
Debt Instrument, Description			The 2017 Credit Facility matures on the earlier of (i) April 18, 2023, or (ii) in the event such debt is not repaid or refinanced, 91 days prior to the maturity of either of the Company’s 2022 Notes or the Company’s 2020 Notes. At the Company’s election, the interest rate on borrowings under the 2017 Credit Facility are based on either (i) the then applicable base rate (as defined in the 2017 Credit Facility) as, for any day, a rate per annum (rounded upward, if necessary, to the next 1/100th of 1%) equal to the greater of (a) the prime rate published in the Wall Street Journal, (b) 1/2 of 1% in excess rate of the overnight Federal Funds Rate at any given time, (c) the one-month LIBOR rate commencing on such day plus 1.00%) and (d) 2%, or (ii) the then applicable LIBOR rate (as defined in the 2017 Credit Facility). The average interest rate was approximately 6.07% for 2018 and was 5.31% for 2017.
Gains (Losses) on Extinguishment of Debt, Total														7,100,000
Debt Instrument, Interest Rate Terms			The 2017 Credit Facility contains customary representations and warranties and events of default, affirmative and negative covenants (in each case, subject to materiality exceptions and qualifications) which may be more restrictive than those governing the Notes. The 2017 Credit Facility also contains certain financial covenants, including a maintenance covenant requiring the Company’s interest expense coverage ratio (defined as the ratio of consolidated EBITDA to consolidated interest expense) to be greater than or equal to 1.25 to 1.00 and its total senior secured leverage ratio (defined as the ratio of consolidated net senior secured indebtedness to consolidated EBITDA) to be less than or equal to 5.85 to 1.00.
Long-term Debt						323,926,000				347,375,000	347,375,000		323,926,000	347,375,000
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 192,000,000
Long-term Debt, Gross						192,000,000							$ 192,000,000			$ 192,000,000
Debt Instrument, Description													The 2018 Credit Facility matures on December 31, 2022 (the "Maturity Date"). Interest rates on borrowings under the 2018 Credit Facility will be either (i) from the Funding Date to the Maturity Date, 12.875% per annum, (ii) 11.875% per annum, once 50% of the term loan borrowings have been repaid or (iii) 10.875% per annum, once 75% of the term loan borrowings have been repaid. Interest payments begin on the last day of the 3-month period commencing on the Funding Date.
Debt Instrument, Interest Rate Terms													Borrowings under the 2018 Credit Facility are subject to customary conditions precedent, as well as a requirement under the 2018 Credit Facility that (i) the Company's total gross leverage ratio on a pro forma basis be not greater than 8:00 to 1:00 (this total gross leverage ratio test steps down as described below), (ii) neither of the administrative agents under the Company's existing credit facilities nor the trustee under the Company's existing senior secured notes due 2022 have objected to the terms of the new credit documents and (iii) certification by the Company that the terms and conditions of the 2018 Credit Facility satisfy the requirements of the definition of "Permitted Refinancing" (as defined in the agreements governing the Company's existing credit facilities) and neither of the administrative agents under the Company's existing credit facilities notifies the Company within five (5) business days prior to funding the borrowings under the 2018 Credit Facility that it disagrees with such determination (including a reasonable description of the basis upon which it disagrees).
Interest Expense, Total													$ 2,900,000	3,600,000
Debt Instrument Additional Interest Payment Term On Prepayment													The term loans may be voluntarily prepaid prior to February 15, 2020 subject to payment of a prepayment premium. The Company will be required to repay principal to the extent then outstanding on each quarterly interest payment date, commencing on the quarterly interest payment date ending March 2019, equal to one quarter of 7.5% of the aggregate initial principal amount of all term loans incurred on the Funding Date to December 2019, commencing on the quarterly interest payment date ending March 2020, one quarter of 10.0% of the aggregate initial principal amount of all term loans incurred on the Funding Date to December 2021, and, commencing on the quarterly interest payment date ending March 2021, one quarter of 12.5% of the aggregate initial principal amount of all term loans incurred on the Funding Date to December 2022. The Company will also be required to use 75% of excess cash flow (as defined in the 2018 Credit Facility, which exclude any distributions to the Company or its restricted subsidiaries in respect of its interests in the MGM National Harbor) to repay outstanding term loans at par, paid semiannually and to use 100% of all distributions to the Company or its restricted subsidiaries received in respect of its interest in the MGM National Harbor to repay outstanding terms loans at par.
Long-term Debt						192,000,000				0	0		$ 192,000,000	0
Debt Instrument, Unamortized Discount (Premium), Net						3,800,000							3,800,000
2018 Credit Facility [Member] | Debt Financing Cost [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net						$ 875,000							$ 875,000
Senior Subordinated Notes Due From 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					7.375%
Gains (Losses) on Extinguishment of Debt, Total							$ 120,000	$ 626,000	$ 239,000		1,200,000	$ 690,000
Debt Instrument, Repurchase Amount							$ 5,000,000	$ 14,000,000	$ 11,000,000	$ 20,000,000	$ 20,000,000	$ 20,000,000		$ 20,000,000
Debt Instrument, Redemption Price, Percentage							97.25%	95.125%	97.375%	93.625%