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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments in and Advances to Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 1,484,717	$ 1,447,043
CityCenter Holdings LLC As Investee [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	515,472	441,893
MGP BREIT Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	813,850	810,066
BetMGM [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	22,057	27,310
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 133,338	$ 167,774

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- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

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