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LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 8,607,137 |  | $ 12,860,966 |
Less: Premiums, discounts, and unamortized debt issuance costs, net | (45,878) |  | (90,169) |
Long-term debt | 8,561,259 |  | 12,770,797 |
Less: Current portion | (1,351,422) |  | (1,000,000) |
Long-term debt, net | 7,209,837 |  | 11,770,797 |
MGP OP senior secured credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 0 |  | 50,000 |
M G M China Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 1,242,070 |  | 360,414 |
MGM China Second Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 12,739 |  | 0 |
LeoVegas Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 39,206 |  | 0 |
7.75% senior notes, due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 7.75% | 7.75% |  |
Senior notes | $ 0 |  | 1,000,000 |
6% senior notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 6.00% |  |  |
Senior notes | $ 1,250,000 |  | 1,250,000 |
5.625% MGP OP senior notes, due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.625% |  |  |
Senior notes | $ 0 |  | 1,050,000 |
5.375% MGM China senior notes, due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.375% |  |  |
Senior notes | $ 750,000 |  | 750,000 |
6.75% senior notes, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 6.75% |  |  |
Senior notes | $ 750,000 |  | 750,000 |
5.75% senior notes, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.75% |  |  |
Senior notes | $ 675,000 |  | 675,000 |
4.625% MGP OP senior notes, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.625% |  |  |
Senior notes | $ 0 |  | 800,000 |
5.25% MGM China senior notes, due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.25% |  |  |
Senior notes | $ 500,000 |  | 500,000 |
5.875% MGM China senior notes, due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.875% |  |  |
Senior notes | $ 750,000 |  | 750,000 |
4.5% MGP OP senior notes, due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.50% |  |  |
Senior notes | $ 0 |  | 500,000 |
4.625% senior notes, due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.625% |  |  |
Senior notes | $ 400,000 |  | 400,000 |
5.75% MGP OP senior notes, due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.75% |  |  |
Senior notes | $ 0 |  | 750,000 |
5.5% senior notes, due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 5.50% |  |  |
Senior notes | $ 675,000 |  | 675,000 |
4.75% MGM China senior notes, due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.75% |  |  | 4.75%
Senior notes | $ 750,000 |  | 750,000 |
4.5% MGP OP senior notes, due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.50% |  |  |
Senior notes | $ 0 |  | 350,000 |
4.75% senior notes, due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 4.75% |  |  |
Senior notes | $ 750,000 |  | 750,000 |
3.875% MGP OP senior notes, due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 3.875% |  |  |
Senior notes | $ 0 |  | 750,000 |
7% debentures, due 2036 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 7.00% |  |  |
Senior notes | $ 552 |  | 552 |
LeoVegas Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, interest rate (in percent) | 6.98% |  |  |
Senior notes | $ 62,570 |  | $ 0 |

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