XML 61 R45.htm IDEA: XBRL DOCUMENT v3.7.0.1
Shareholders' Equity and Partners' Capital - Narrative (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 15, 2017
Mar. 31, 2017
Dec. 31, 2016
Stockholders Equity and Partners Capital [Line Items]      
Dividend declared (in usd per share)   $ 0.3875  
MGM      
Stockholders Equity and Partners Capital [Line Items]      
Ownership interest in operating partnership   73.30%  
MGP Operating Partnership      
Stockholders Equity and Partners Capital [Line Items]      
Cash distribution declared (in usd per unit) $ 0.3875 $ 0.3875  
Dividends declared | MGP Operating Partnership      
Stockholders Equity and Partners Capital [Line Items]      
Common stock, dividend $ 94.1    
Class A Shares      
Stockholders Equity and Partners Capital [Line Items]      
Common stock shares, par value   0 $ 0
Dividend declared (in usd per share)   $ 0.3875  
Class A Shares | Dividends declared      
Stockholders Equity and Partners Capital [Line Items]      
Common stock, dividend   $ 22.3  
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   $ 0  
IPO      
Stockholders Equity and Partners Capital [Line Items]      
Ownership percentage acquired   26.70%  
IPO | Class A Shares      
Stockholders Equity and Partners Capital [Line Items]      
Shares issued under initial public offering (in shares)   57,500,000  
Borgata | MGM      
Stockholders Equity and Partners Capital [Line Items]      
Increase in ownership interest in operating partnership   76.30%  
Borgata | IPO      
Stockholders Equity and Partners Capital [Line Items]      
Reduction in ownership percentage acquired   23.70%