Business (Details)	3 Months Ended
	Mar. 31, 2018 shares	Dec. 31, 2017 shares
Business And Organization [Line Items]
Ownership percentage acquired	26.60%
Exchange of Operating Partnership Units to MGP's Class A Shares
Business And Organization [Line Items]
Operating Partnership unit conversion ratio	1
MGM
Business And Organization [Line Items]
Operating Partnership units held (in shares)	195,134,123
Increase in ownership interest in operating partnership	73.40%
MGP Operating Partnership
Business And Organization [Line Items]
Operating Partnership units outstanding (in shares)	266,030,918	266,030,918