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LONG-TERM DEBT - Additional Information (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Feb. 19, 2021 USD ($) | Jan. 08, 2021 | Nov. 09, 2020 USD ($) | Nov. 13, 2019 USD ($) | Apr. 18, 2017 USD ($) | Apr. 17, 2015 USD ($) | Apr. 18, 2017 USD ($) | Apr. 21, 2016 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Aug. 01, 2021 | Jan. 15, 2021 | Jan. 07, 2021 USD ($) | Oct. 31, 2020 | Jun. 25, 2020 USD ($) | Dec. 31, 2018 | Dec. 20, 2018 USD ($) | Oct. 15, 2015 | Feb. 24, 2015 USD ($) | Feb. 04, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs included in interest expense |  |  |  |  |  |  |  |  | $ 501,000 | $ 824,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description |  |  |  |  | In addition to any mandatory or optional prepayments, the Company was required to pay interest on the term loans (i) quarterly in arrears for the base rate loans, and (ii) on the last day of each interest period for LIBOR loans. Certain voluntary prepayments of the term loans during the first six months required an additional prepayment premium. Beginning with the interest payment date occurring in June 2017 and ending in March 2023, the Company was 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. |  |  |  | The 2018 Credit Facility contained 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, as amended, also contained 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, 6.75 to 1.00 in 2022 and 6.25 to 1.00 in 2023. |  |  |  |  |  |  |  |  |  |  |  |
LOSS ON RETIREMENT OF DEBT |  |  |  |  |  |  |  |  | $ 0 | 6,949,000 |  |  |  |  |  |  |  |  |  |  |
Amortization of debt premium |  |  |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description |  |  |  |  |  | The 7.375% Notes were offered at an original issue price of 100.0% plus accrued interest from April 17, 2015 and matured on April 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2028 Notes Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 825,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  |
Percentage of issue price |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | 15,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs included in interest expense |  |  |  |  |  |  |  |  | $ 501,000 | $ 824,000 |  |  |  |  |  |  |  |  |  |  |
LOSS ON RETIREMENT OF DEBT |  |  |  |  |  |  |  |  |  |  | $ (6,900,000) |  |  |  |  |  |  |  |  |  |
Debt instrument effective interest rate |  |  |  |  |  |  |  |  | 7.72% |  | 7.96% |  |  |  |  |  |  |  |  |  |
MGM National Harbor Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |
Interest rate |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Limited ability for prepayment period |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Percentage Paid In Kind |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
7.375% Senior Secured Notes due April 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 347,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 7.375% |  |  | 7.375% |  |  | 7.375% |  |  | 7.375% |  |  | 7.375% |  |  |  | 7.375% |  |
Percentage of exchange offer |  |  | 99.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.75% Senior Secured Notes due December 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 8.75% |  |  |  |  |  | 8.75% |  |  |  | 8.75% |  | 8.75% |  |  |  |  |  |
Percentage of voting stock as lien for secured debt in case of foreign subsidiary |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non-voting stock as lien for secured debt in case of foreign subsidiary |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of excess cash flow |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Amount redeemable |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
ABL Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 37,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to maturity of senior secured notes | 91 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50,000,000 |  |  | 37,500,000 |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit facility, maximum capacity | $ 5,000,000 |  |  | $ 7,500,000 |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 1,200,000
Percentage Borrowing Of Eligible Accounts | 85.00% |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to the earlier to occur of the term loan maturity or stated maturity |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABL Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description |  |  |  |  |  |  |  |  | Until its termination on settlement of the 2028 Notes, borrowings under the 2018 Credit Facility were 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 satisfied 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 notified the Company within five (5) business days prior to funding the borrowings under the 2018 Credit Facility that it disagreed with such determination (including a reasonable description of the basis upon which it disagrees). |  |  |  |  |  |  |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit facility, maximum capacity |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability |  |  |  |  |  |  |  |  | 871,000 |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 7.375% |  | 7.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant Compliance Description For Maintaining Interest Coverage Ratio |  |  |  |  |  |  |  |  | maintaining an interest coverage ratio of no less than: |  |  |  |  |  |  |  |  |  |  |  |
Covenant Compliance Description For Maintaining Total Leverage Ratio |  |  |  |  |  |  |  |  | maintaining a senior leverage ratio of no greater than: |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description |  |  |  |  |  |  | Until its termination on settlement of the 2028 Notes, the 2017 Credit Facility matured 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 the Company’s 7.375% Notes (as defined below). 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 5.0% for 2021. |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  | $ 3,600,000 |  | $ 192,000,000.0 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.25% |  |  |  |
Debt Instrument, Description |  |  |  |  |  |  |  |  | The 2018 Credit Facility was scheduled to mature on December 31, 2022 (the “Maturity Date”). In connection with the November 2020 Exchange Offer, we also entered into an amendment to certain terms of our 2018 Credit Facility including the extension of the maturity date to March 31, 2023. Interest rates on borrowings under the 2018 Credit Facility were 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 had been repaid or (iii) 10.875% per annum, once 75% of the term loan borrowings had been repaid. Interest payments began on the last day of the 3-month period commencing on the Funding Date. Within 90 days following the completion of the November 2020 Exchange Offer, the Company was required to repay $10 million of the 2018 Credit Facility. The amendment was accounted for as a modification in accordance with the provisions of ASC 470, “Debt”. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Additional Interest Payment Term On Prepayment |  |  |  |  |  |  |  |  | The term loans could be voluntarily prepaid prior to February 15, 2020 subject to payment of a prepayment premium. The Company was required to repay principal to the extent then outstanding on each quarterly interest payment date, commencing on the last business day in 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 last business day in 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 last business day in 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 was also required to use 75% of excess cash flow (“ECF payment”) as defined in the 2018 Credit Facility, which excluded 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. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility | Debt Financing Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | $ 875,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility 2017 And 2018 | 7.375% Senior Secured Notes due April 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility 2017 And 2018 | 8.75% Senior Secured Notes due December 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |  |  |  |  |  |  |  |

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