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Acquisition - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 29, 2019	Dec. 31, 2018	Jul. 06, 2018	Dec. 31, 2017
Fair value of assets acquired and liabilities assumed:
Goodwill	$ 2,084,564		$ 1,821,392		$ 1,806,531
MGM Growth Properties LLC [Member] | Empire City [Member]
Fair value of assets acquired and liabilities assumed:
Property and equipment		$ 645,733
Cash and cash equivalents		63,197
Racing and gaming license		52,000
Other intangible assets		34,000
Goodwill		256,133
Other assets		24,420
Deferred income taxes		(125,149)
Other liabilities		(85,690)
Business combination, assets acquired and liabilities assumed		$ 864,644
MGM Growth Properties LLC [Member] | Northfield Park associates LLC [Member]
Fair value of assets acquired and liabilities assumed:
Property and equipment				$ 792,807
Cash and cash equivalents				35,831
Racing and gaming license				228,000
Customer list				25,000
Goodwill				17,915
Other assets				9,598
Other liabilities				(38,786)
Business combination, assets acquired and liabilities assumed				$ 1,070,365

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