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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | May 31, 2019 | Apr. 30, 2019 | Feb. 28, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2021 | Nov. 30, 2020 | Oct. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Jan. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment and termination of existing revolving facility |  |  |  |  |  |  |  |  | $ 0 | $ 846,815,000 | $ 3,764,167,000 |  |  |  |  |  |
Loss on debt retirement |  |  |  |  | $ (171,000,000) | $ (16,000,000) |  |  | (37,000) | (126,462,000) | $ (198,151,000) |  |  |  |  |  |
Credit facility amount |  |  |  |  |  |  |  |  | 12,860,966,000 | 12,480,586,000 |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |
Fair value of interest rate swaps designated as cash flow hedges recorded as liability |  |  |  |  |  |  |  |  | 25,000,000 | 41,000,000 |  |  |  |  |  |  |
Fair value of interest rate swaps designated as cash flow hedges recorded as current liability |  |  |  |  |  |  |  |  | 5,000,000 | 1,000,000 |  |  |  |  |  |  |
Fair value of interest rate swaps designated as cash flow hedges recorded as long-term liability |  |  |  |  |  |  |  |  | 20,000,000 | 40,000,000 |  |  |  |  |  |  |
Fair value of interest rate swaps not designated as cash flow hedges recorded as liability |  |  |  |  |  |  |  |  | 27,000,000 | 78,000,000 |  |  |  |  |  |  |
Fair value of interest rate swaps not designated as cash flow hedges recorded as current liability |  |  |  |  |  |  |  |  | 8,000,000 | 31,000,000 |  |  |  |  |  |  |
Fair value of interest rate swaps not designated as cash flow hedges recorded as long-term liability |  |  |  |  |  |  |  |  | 19,000,000 | 47,000,000 |  |  |  |  |  |  |
Line of credit facility, increased amount of borrowing capacity |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  |  |  |  | 13,400,000,000 | 13,200,000,000 |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates |  |  |  |  |  |  |  |  | 967,044,000 | 1,447,043,000 |  |  |  |  |  |  |
BetMGM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates |  |  |  |  |  |  |  |  | 41,060,000 | 27,310,000 |  | $ 1,675,000,000 |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 900,000,000 |  |  |  |  |  |  |  |
Weighted Average fixed interest rate |  |  |  |  |  |  |  |  | 1.783% |  |  |  |  |  |  |  |
5.75% Operating Partnership senior notes, due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |
4.75% senior notes, due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 4.75% |  |  |  |  | 4.75% |  |  |
6.75% Senior Notes, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.75% |  |  |  |  |  |  | 6.75% |
5.75% Senior Notes, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
4.625% senior notes, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  | 4.625% |  |  |  |  |  | 4.625% |  |  |  |  |  |  |  |
5.5% Senior Notes, Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.5% Senior Notes, Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  | 5.50% |  |  |  | 5.50% |  | 5.50% |  |  |  |  |  |
3.875% Operating Partnership senior notes, due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.875% |  |  |  |
4.625% Operating Partnership senior notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 4.625% |  |  |  |  |  | 4.625% |  |
5.25% MGM China senior notes, due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  | 5.25% |  |
5.375% MGM China Senior Notes, Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |
5.875% MGM China Senior Notes, Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.875% |  |  |  |  |  |  |  |
4.75% MGM China senior notes, due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  | 4.75% |  |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |
Debt instrument issued price percentage |  | 99.97% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2020 5.250% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  | 5.25% |  |  |  |  |  | 5.25% |  |  |  |  |  |
Redemption of debt |  |  |  |  | $ 267,000,000 |  | 233,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2020 6.750% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  | 6.75% |  |  |  |  |  | 6.75% |  |  |  |  |  |
Redemption of debt |  |  |  |  | $ 361,000,000 |  | $ 639,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2021 6.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  | 6.625% |  |  |  |  |  | 6.625% |  |  |  |  |  |
Redemption of debt |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2019 8.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  | 8.625% |  |  |  |  |  |  |  |  |
Redemption of debt |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |  |  |  |  |  |
Senior Notes Due 2027 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000
Long-term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%
MGM China Senior Notes Due 2024 5.375 Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |
MGM China Senior Notes Due 2026 5.875 Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  |  | 5.875% |  |  |  |  |  |  |  |  |  |  |
Operating Partnership Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt retirement |  |  |  | $ (18,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership Senior Credit Facility | Term Loan B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding term loan facility |  |  |  | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Partnership Senior Credit Facility | Term Loan A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding term loan facility |  |  |  | $ 399,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt retirement |  |  | $ (105,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
CityCenter Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  | $ 1,729,451,000 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | 5.75% Senior Notes, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  | 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | 4.625% senior notes, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | 5.5% Senior Notes, Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  |  |  |  | 1,350,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Operating Partnership Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 1.85% |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | LIBOR | Operating Partnership Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | HIBOR | MGM China First Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 1.625% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | LIBOR | Operating Partnership Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | HIBOR | MGM China First Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | MGM China First Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  | $ 1,250,000,000 |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | MGM China Second Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | Minimum | HIBOR | MGM China Second Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 1.625% |  |  |  |  |  |  |  |
Unsecured Revolving Credit Facility | Maximum | HIBOR | MGM China Second Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |
MGM China First Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  |  |  |  | $ 360,414,000 | $ 770,034,000 |  |  |  |  |  |  |
Term Loan | MGM China First Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  | $ 360,000,000 |  |  |  |  |  |  |  |
Debt instrument, weighted average interest rate |  |  |  |  |  |  |  |  | 2.95% |  |  |  |  |  |  |  |
Senior Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  | $ 1,675,000,000 |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Senior Credit Facility | Revolving Credit Facility | MGP BREIT Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |
Senior Credit Facility | Unsecured Revolving Credit Facility | MGP BREIT Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment and termination of existing revolving facility | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt retirement | $ (4,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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