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Redeemable Non-Controlling Interest (Details) - $ / shares
9 Months Ended
Apr. 16, 2018
Mar. 01, 2018
Sep. 30, 2018
Dec. 31, 2017
Temporary Equity [Line Items]        
Interest rate of preferred stock 6.25%      
VIE, Primary Beneficiary | HPP-MAC WSP, LLC        
Temporary Equity [Line Items]        
Ownership Interest   75.00% 75.00%  
Preferred Class A        
Temporary Equity [Line Items]        
Preferred A shares outstanding (in shares)       407,066
Shares redeemed during period (in shares) 14,468      
Redemption price (in dollars per share) $ 25.00      
Redeemable non-controlling interest, liquidation preference (in dollars per share)     $ 25.00