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Shareholders' Equity and Partners' Capital - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 15, 2017
Sep. 11, 2017
Jun. 15, 2017
Mar. 15, 2017
Aug. 01, 2016
Apr. 25, 2016
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
MGM                        
Stockholders Equity and Partners Capital [Line Items]                        
Ownership interest in operating partnership           73.30%       73.30%    
MGP Operating Partnership                        
Stockholders Equity and Partners Capital [Line Items]                        
Cash distribution declared (in usd per unit) $ 0.3950     $ 0.3875     $ 0.3950   $ 0.3875 $ 1.1775 $ 0.6507  
Dividends declared | MGP Operating Partnership                        
Stockholders Equity and Partners Capital [Line Items]                        
Dividends/Distributions $ 101.2   $ 96.0                  
Class A Shares                        
Stockholders Equity and Partners Capital [Line Items]                        
Common stock shares, par value (in usd per share)             0     0   $ 0
Dividend declared (in usd per share)       $ 0.3875     $ 0.3950 $ 0.3950 $ 0.3875 $ 1.1775 $ 0.6507  
Class A Shares | Dividends declared                        
Stockholders Equity and Partners Capital [Line Items]                        
Dividends/Distributions             $ 28.0 $ 22.8        
Class B Share                        
Stockholders Equity and Partners Capital [Line Items]                        
Percentage of ownership, below which Class B not entitled to voting rights                   30.00%    
Common stock shares, par value (in usd per share)             $ 0     $ 0    
IPO                        
Stockholders Equity and Partners Capital [Line Items]                        
Ownership percentage acquired           26.70%       26.70%    
IPO | Class A Shares                        
Stockholders Equity and Partners Capital [Line Items]                        
Shares sold in offering (in shares)                   57,500,000    
Public Stock Offering | Class A Shares                        
Stockholders Equity and Partners Capital [Line Items]                        
Shares sold in offering (in shares)   13,225,000                    
Proceeds from offering   $ 387.5                    
Over-Allotment Option | Class A Shares                        
Stockholders Equity and Partners Capital [Line Items]                        
Shares sold in offering (in shares)   1,725,000                    
Borgata | MGM                        
Stockholders Equity and Partners Capital [Line Items]                        
Increase in ownership interest in operating partnership   72.30%     76.30%         72.30%    
Borgata | IPO                        
Stockholders Equity and Partners Capital [Line Items]                        
Reduction in ownership percentage acquired   27.70%     23.70%         27.70%