Business - Narrative (Detail) $ / shares in Units, $ in Billions				9 Months Ended
	Sep. 11, 2017	Aug. 01, 2016	Apr. 25, 2016	Sep. 30, 2017 USD ($) $ / shares shares
Business And Organization [Line Items]
Ownership interest transferred				100.00%
MGM
Business And Organization [Line Items]
Ownership interest in operating partnership			73.30%	73.30%
MGM | Borgata
Business And Organization [Line Items]
Increase in ownership interest in operating partnership	72.30%	76.30%		72.30%
MGP Operating Partnership
Business And Organization [Line Items]
Deb facilities assumed from Parent | $				$ 4
IPO
Business And Organization [Line Items]
Initial offering price per share (in usd per share) | $ / shares				$ 21.00
Ownership percentage acquired			26.70%	26.70%
IPO | Borgata
Business And Organization [Line Items]
Reduction in ownership percentage acquired	27.70%	23.70%		27.70%
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