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Borrowings - Additional Information (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 29, 2016
Mar. 03, 2016
Sep. 30, 2015
Dec. 31, 2014
Feb. 10, 2014
Subsequent Event | Affiliated Entity          
Debt Instrument [Line Items]          
Due to related parties $ 1.1        
Extinguishment of debt, amount $ 0.3        
Subsequent Event | RMC6, LLC (RCM6) | Disposed of by Sale          
Debt Instrument [Line Items]          
Ownership interest, percent   24.95%      
RMC6, LLC (RCM6)          
Debt Instrument [Line Items]          
Interest rate, stated percentage         1.65%
Interest rate, effective percentage         20.00%
Ownership interest, percent     24.95% 24.95% 24.95%
RMC6, LLC (RCM6) | Notes Payable          
Debt Instrument [Line Items]          
Unamortized discount     $ 8.1 $ 10.1