Business acquisition month of acquisition agreement.

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Common stock shares acquired.

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Issuance of operating partnership units.

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Minority interest ownership percentage in consolidated subsidiary.

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Minority interest ownership percentage in unconsolidated affiliate.

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Number of integrated casino.

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Organization disclosure.

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Partners capital account available as per agreement for redemptions.

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Partners capital account redemptions discount percentage.

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Partners capital account redemptions per unit.

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Percent interest in a less than hundred percent owned consolidated affiliate.

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Percentage of issuance of operating partnership units to equity value of consolidated subsidiary.

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Reduction in lease rent.

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Required minimum ownership percentage in beneficial ownership to entitle majority of voting power.

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Selling cost of real estate.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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The cash outflow to reacquire common stock during the period.

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The cash inflow from the sale of real estate held-for-investment and real estate joint ventures.

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Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest.

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Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Organization - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions							1 Months Ended		12 Months Ended
	Dec. 02, 2020 USD ($) $ / shares shares	May 18, 2020 USD ($) $ / shares shares	Feb. 14, 2020 USD ($) shares	Feb. 13, 2020 shares	Nov. 22, 2019 shares	Nov. 15, 2019 USD ($)	Feb. 29, 2020 shares	Jan. 31, 2019 shares	Dec. 31, 2020 USD ($) Property Segment	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Sep. 01, 2016 shares
Organization Disclosure [Line Items]
Gain on sale of real estate assets									$ 1,491,945	$ 2,677,996	$ 0
Assumption of debt									12,480,586	11,271,706
Payment for purchase of common shares									353,720	$ 1,031,534	$ 1,283,333
Operating partnership units, redeemed \| shares	24.0	30.0
Cash proceeds for redemption	$ 700,000	$ 700,000							$ 22,292
Operating partnership redemption per unit \| $ / shares	$ 29.78	$ 23.10
Number of integrated casino \| Property									2
Number of reportable segments \| Segment									3
CityCenter Holdings LLC As Investee [Member]
Organization Disclosure [Line Items]
Percentage ownership interest									50.00%	50.00%
BetMGM LLC [Member]
Organization Disclosure [Line Items]
Percentage ownership interest									50.00%
Infinity World Development Corp [Member] \| CityCenter Holdings LLC As Investee [Member]
Organization Disclosure [Line Items]
Percentage ownership interest									50.00%
Entain [Member] \| BetMGM LLC [Member]
Organization Disclosure [Line Items]
Percentage ownership interest									50.00%
Hard Rock Rocksino Northfield Park [Member]
Organization Disclosure [Line Items]
Date of acquisition agreement									2018-07
Bellagio B R E I T Venture
Organization Disclosure [Line Items]
Percentage of minority interest									5.00%
MGP BREIT Venture [Member]
Organization Disclosure [Line Items]
Partnership interest									50.10%
Percentage of minority interest									49.90%
Total consideration received from sale of real estate assets			$ 4,600,000
Cash received from sale of real estate assets			$ 2,500,000
Guarantee obligation amount									$ 3,000,000
Operating partnership equity interest			50.10%
Issuance of operating partnership units \| shares			3.0				3.0
Percentage of issuance of operating partnership units to equity value of consolidated subsidiary			5.00%
Reduction in lease annual rent due to modification			$ 133,000
MGP BREIT Venture [Member] \| Term Loan B [Member]
Organization Disclosure [Line Items]
Assumption of debt			$ 1,300,000
Blackstone Real Estate Income Trust [Member]
Organization Disclosure [Line Items]
Percentage of ownership interest						5.00%
Total consideration received from sale of real estate assets						$ 4,250,000
Cash received from sale of real estate assets						4,200,000
Gain on sale of real estate assets						2,700,000
Guarantee obligation amount						$ 3,010,000			$ 3,010,000
Blackstone Real Estate Income Trust [Member] \| Class A Shareholders [Member]
Organization Disclosure [Line Items]
Ordinary shares acquired \| shares			5.0
Payment for purchase of common shares			$ 150,000
MGM Grand Las Vegas [Member]
Organization Disclosure [Line Items]
Total consideration received from sale of real estate assets			2,500,000
Gain on sale of real estate assets			1,700,000
Carrying value of real estate assets			733,000
Selling Cost Of Real Estate			27,000
Mandalay Bay [Member]
Organization Disclosure [Line Items]
Total consideration received from sale of real estate assets			2,100,000
Gain on sale of real estate assets			(252,000)
Carrying value of real estate assets			2,300,000
Selling Cost Of Real Estate			$ 10,000
Subsidiary Of Blackstone Real Estate Income Trust \| Bellagio B R E I T Venture
Organization Disclosure [Line Items]
Percentage of ownership interest									95.00%
Class A shares [Member]
Organization Disclosure [Line Items]
Common stock voting rights									one vote per share
Non-Guarantor MGP Subsidiaries [Member] \| Class B shares [Member]
Organization Disclosure [Line Items]
Common stock voting rights									Class B share, is entitled to an amount of votes representing a majority of the total voting power of MGP’s shares so long as the Company and its controlled affiliates’ (excluding MGP) aggregate beneficial ownership of the combined economic interests in MGP and the Operating Partnership does not fall below 30%.
MGM Growth Properties LLC [Member]
Organization Disclosure [Line Items]
Minimum ownership percentage required for majority voting interest									30.00%
Partnership interest									53.00%
Percentage of minority interest									47.00%
Redemptions discount percentage			3.00%
MGM Growth Properties LLC [Member] \| Maximum [Member]
Organization Disclosure [Line Items]
Cash proceeds for redemption			$ 1,400,000
MGM Growth Properties LLC [Member] \| Class A shares [Member]
Organization Disclosure [Line Items]
Issuance of operating partnership units \| shares			5.0	13.0	18.0			20.0		5.0
MGM China [Member]
Organization Disclosure [Line Items]
Ordinary shares acquired \| shares												188.1
Percentage ownership interest									56.00%