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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments in and Advances to Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 941,145	$ 1,447,043
City Center
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest		50.00%
Investments in and advances to unconsolidated affiliates	$ 0	$ 441,893
MGP BREIT Venture
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest	50.10%	50.10%
Investments in and advances to unconsolidated affiliates	$ 815,399	$ 810,066
BetMGM
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest	50.00%	50.00%
Investments in and advances to unconsolidated affiliates	$ 22,983	$ 27,310
Other
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$ 102,763	$ 167,774

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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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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+ References

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