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Investments in and Advances to Unconsolidated Affiliates - Schedule of Share of Income (Loss) From Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule Of Equity Method Investments [Line Items]
Income (loss) from unconsolidated affiliates	$ 83,338	$ (8,353)	$ 57,759	$ 27,395
CityCenter Holdings LLC As Investee [Member]
Schedule Of Equity Method Investments [Line Items]
Income (loss) from unconsolidated affiliates	90,212	(39,113)	87,380	(18,447)
MGP BREIT Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Income (loss) from unconsolidated affiliates	38,954	38,861	77,917	58,811
BetMGM [Member]
Schedule Of Equity Method Investments [Line Items]
Income (loss) from unconsolidated affiliates	(45,979)	(5,241)	(105,215)	(15,918)
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Income (loss) from unconsolidated affiliates	$ 151	$ (2,860)	$ (2,323)	$ 2,949

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- Definition

This item represents the entity's proportionate share for the period of the operating income (loss) of its investees (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied, excluding pre-opening expenses. Such amount typically reflects adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.

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- Definition

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