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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated affiliates	$ 35,111	$ 20,635	$ 92,870	$ 48,030
City Center
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated affiliates	40,747	(6,041)	128,127	(24,489)
MGP BREIT Venture
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated affiliates	38,959	38,976	116,876	97,787
BetMGM
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated affiliates	(49,060)	(9,057)	(154,275)	(24,976)
Other
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated affiliates	$ 4,465	$ (3,243)	$ 2,142	$ (292)

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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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