Business - Narrative (Detail) $ / shares in Units, $ in Billions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Business And Organization [Line Items]
Ownership interest transferred	100.00%
MGP Operating Partnership
Business And Organization [Line Items]
Deb facilities assumed from Parent | $	$ 4
MGM
Business And Organization [Line Items]
Ownership interest in operating partnership	73.30%
MGM | Borgata
Business And Organization [Line Items]
Increase in ownership interest in operating partnership	76.30%
IPO
Business And Organization [Line Items]
Initial offering price per share | $ / shares	$ 21.00
Ownership percentage acquired	26.70%
IPO | Borgata
Business And Organization [Line Items]
Reduction in ownership percentage acquired	23.70%
IPO | Class A Shares
Business And Organization [Line Items]
Shares issued under initial public offering (in shares)	57,500,000
Over-Allotment Option | Class A Shares
Business And Organization [Line Items]
Shares issued under initial public offering (in shares)	7,500,000
Operating Partnership Units to MGP's Class A Shares
Business And Organization [Line Items]
Operating Partnership unit conversion	1