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Investments in and Advances to Unconsolidated Affiliates - Tabular Disclosure of Differences between Share of Venture-Level Equity and Investment Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]
Venture-level equity attributable to the Company	$ 2,399,993	$ 2,347,103
Other adjustments	41,461	39,735
Investment balance	822,366	732,867
CityCenter Holdings LLC As Investee [Member]
Schedule Of Equity Method Investments [Line Items]
Adjustment to CityCenter equity upon contribution of net assets by MGM resorts International	(509,382)	(514,592)
CityCenter capitalized interest	177,898	186,830
CityCenter completion guarantee	261,708	274,685
CityCenter deferred gain	(210,240)	(212,276)
CityCenter capitalized interest on sponsor notes	(34,755)	(36,500)
Other-than-temporary impairments of investment	(1,304,317)	(1,352,118)
Investment balance	$ 568,879	$ 589,965

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- Definition

The item represents the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee attributable to interest capitalized during the unconsolidated affiliate's development and construction stages.

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- Definition

The item represents the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee attributable to the entity's completion guarantee obligations.

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Equity​ method investment difference between carrying ​amount and underlying equity contribution attributable to capitalized interest from loans to the affiliate.

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The item represents the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee attributable to net assets contributed by the entity.

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The item represents the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee attributable to other adjustments not otherwise specified.

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- Definition

The item represents the difference between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee attributable to the write-down of investment.

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- Definition

This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.

+ 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)(3)
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Amount of investment in equity method investee and investment in and advance to affiliate.

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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=6877327&loc=d3e13212-122682

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