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Organization - Additional Information (Detail) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 15, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019	Sep. 30, 2019 Segment	Apr. 30, 2019	Jan. 31, 2019	Dec. 31, 2018
Organization Disclosure [Line Items]
Percentage of minority interest				32.30%
Number of reportable segments | Segment				3
CityCenter Holdings LLC As Investee [Member]
Organization Disclosure [Line Items]
Percentage ownership interest				50.00%			50.00%
Infinity World Development Corp [Member] | CityCenter Holdings LLC As Investee [Member]
Organization Disclosure [Line Items]
Percentage ownership interest				50.00%
Blackstone Real Estate Income Trust [Member] | Subsequent Event [Member]
Organization Disclosure [Line Items]
Initial annual rent	$ 245
Annual rent escalator from year one through year ten	2.00%
Annual rent escalator cap from year eleven through year twenty	3.00%
Annual rent escalator after year twenty	4.00%
Percentage of equity interest in joint venture	5.00%
Amounts owed to the Company by joint venture	$ 4,200
Blackstone Real Estate Income Trust [Member] | Subsequent Event [Member] | Minimum [Member]
Organization Disclosure [Line Items]
Annual rent escalator from year eleven through year twenty	2.00%
Hard Rock Rocksino Northfield Park [Member]
Organization Disclosure [Line Items]
Date of acquisition agreement				2019-04
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		69.80%	69.80%	67.70%	68.80%	74.60%
Percentage of minority interest				32.30%
MGM Growth Properties LLC [Member] | Class A shares [Member]
Organization Disclosure [Line Items]
Partnership interest				67.70%		69.70%
MGM China [Member]
Organization Disclosure [Line Items]
Percentage ownership interest			56.00%
MGM Grand Paradise [Member] | Extension Agreement [Member]
Organization Disclosure [Line Items]
Agreement expiration date		Mar. 31, 2020
Extended expiration date of agreement		Jun. 26, 2022
Contract extension premium paid		$ 25
Contract extension fee paid		$ 2

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