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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total assets | $ 41,338,323 |  | $ 41,338,323 |  | $ 36,494,934
Investments in and advances to unconsolidated affiliates | 941,145 |  | $ 941,145 |  | $ 1,447,043
Percentage of ownership interest |  |  | 100.00% |  |
Fair value of equity investment | 76,000 |  | $ 76,000 |  |
MGM Growth Properties LLC |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total assets | 10,100,000 |  | 10,100,000 |  |
Total liabilities | 5,000,000 |  | 5,000,000 |  |
Other, Net |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gain on change in measurement of equity instrument | 48,000 |  | 39,000 |  |
Food and Beverage Revenue |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Lease revenue | 13,000 | $ 7,000 | 29,000 | $ 21,000 |
Entertainment Retail and Other Revenue |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Lease revenue | 22,000 | $ 14,000 | $ 58,000 | $ 47,000 |
Bellagio Blackstone Real Estate Income Trust |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of ownership interest |  |  | 5.00% |  |
Investments in and advances to unconsolidated affiliates | $ 58,000 |  | $ 58,000 |  |

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