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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 12,715,126 |  | $ 12,480,586
Less: Premiums, discounts, and unamortized debt issuance costs, net | (96,213) |  | (103,902)
Long-term debt | 12,618,913 |  | 12,376,684
Less: Current portion | (1,000,000) |  | 0
Long-term debt, net | 11,618,913 |  | 12,376,684
Operating Partnership Senior Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 0 |  | 10,000
MGM China First Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 264,574 |  | 770,034
7.75% senior notes, due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 7.75% |  |
Senior notes | $ 1,000,000 |  | 1,000,000
6% senior notes, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 6.00% |  |
Senior notes | $ 1,250,000 |  | 1,250,000
5.625% Operating Partnership senior notes, due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 5.625% |  |
Senior notes | $ 1,050,000 |  | 1,050,000
5.375% MGM China senior notes, due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 5.375% |  |
Senior notes | $ 750,000 |  | 750,000
6.75% senior notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 6.75% |  |
Senior notes | $ 750,000 |  | 750,000
5.75% senior notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 5.75% |  |
Senior notes | $ 675,000 |  | 675,000
4.625% Operating Partnership senior notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 4.625% |  |
Senior notes | $ 800,000 |  | 800,000
5.25% MGM China senior notes, due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a 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 (as a percent) | 5.875% |  |
Senior notes | $ 750,000 |  | 750,000
4.5% Operating Partnership senior notes, due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 4.50% |  |
Senior notes | $ 500,000 |  | 500,000
4.625% senior notes, due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 4.625% |  |
Senior notes | $ 400,000 |  | 400,000
5.75% Operating Partnership senior notes, due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 5.75% |  |
Senior notes | $ 750,000 |  | 750,000
5.5% senior notes, due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a 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 (as a percent) | 4.75% | 4.75% |
Senior notes | $ 750,000 |  | 0
4.5% Operating Partnership senior notes, due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 4.50% |  |
Senior notes | $ 350,000 |  | 350,000
4.75% senior notes, due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 4.75% |  |
Senior notes | $ 750,000 |  | 750,000
3.875% Operating Partnership senior notes, due 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 3.875% |  |
Senior notes | $ 750,000 |  | 750,000
7% debentures, due 2036 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate (as a percent) | 7.00% |  |
Senior notes | $ 552 |  | $ 552

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