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Investments in and Advances to Unconsolidated Affiliates - Schedule of Share of Income (Loss) From Unconsolidated Affiliates (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]      
Income from unconsolidated affiliates $ 42,938 $ 119,521 $ 147,690
CityCenter Holdings LLC As Investee [Member]      
Schedule Of Equity Method Investments [Line Items]      
Income from unconsolidated affiliates (29,753) 128,421 138,383
MGP BREIT Venture [Member]      
Schedule Of Equity Method Investments [Line Items]      
Income from unconsolidated affiliates 136,755 0 0
Other [Member]      
Schedule Of Equity Method Investments [Line Items]      
Income from unconsolidated affiliates $ (64,064) $ (8,900) $ 9,307