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Investments in and Advances to Unconsolidated Affiliates - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Apr. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Distributions from unconsolidated affiliates |  |  |  |  | $ 9,245 | $ 63,578
City Center Holdings L L C |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Distribution paid |  | $ 101,000 |  |  |  |
MGP BREIT Venture |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Distributions from unconsolidated affiliates |  |  | $ 24,000 | $ 23,000 | 70,000 | 58,000
BetMGM |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Contributions to unconsolidated affiliates |  |  | $ 50,000 | $ 25,000 | $ 150,000 | 55,000
City Center |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Distributions from unconsolidated affiliates |  | $ 51,000 |  |  |  |
Distributions from unconsolidated affiliates, percentage |  | 50.00% |  |  |  |
Harmon Land | City Center Holdings L L C |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Consideration received from sale of discontinued operations | $ 80,000 |  |  |  |  |
Recognized gain on sale, unconsolidated affiliates and reversal of basis differences | 30,000 |  |  |  |  |
Harmon Land | City Center |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Distributions from unconsolidated affiliates | $ 15,000 |  |  |  |  |
Distributions from unconsolidated affiliates, percentage | 50.00% |  |  |  |  |
Consideration received from sale of discontinued operations | $ 50,000 |  |  |  |  |
Recognized gain on sale, unconsolidated affiliates and reversal of basis differences | $ 35,000 |  |  |  |  |
Other |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Other-than-temporary impairment charges |  |  |  |  |  | $ 64,000

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