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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, 2020	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Venture-level equity attributable to the Company	$ 2,981,550	$ 2,399,993
Other adjustments	49,698	41,461
Investment balance	1,447,043	822,366
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	(504,171)	(509,382)
CityCenter capitalized interest	168,966	177,898
CityCenter completion guarantee	248,730	261,708
CityCenter deferred gain	(208,204)	(210,240)
CityCenter capitalized interest on sponsor notes	(33,010)	(34,755)
Other-than-temporary impairments of investment	(1,256,516)	(1,304,317)
Investment balance	$ 441,893	$ 568,879

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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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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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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
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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
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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