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Sales of Advances and MSRs - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Agency Mortgage Servicing Rights [Member]        
Related Party Transaction [Line Items]        
UPB of Agency MSRs sold $ 87,600.0      
NRZ transactions relating to the rights to MSRs, UPB 89,000.0      
NRZ [Member]        
Related Party Transaction [Line Items]        
Outstanding servicing advances $ 5,100.0      
Period from sale of tranche of rights to mortgage servicing rights that apportionment of fees is subject to re-negotiation 8 years      
Liquidating damages paid $ 2.2      
HLSS [Member]        
Related Party Transaction [Line Items]        
Outstanding servicing advances   $ 6,100.0    
NRZ transactions relating to the rights to MSRs, UPB     $ 119,700.0 $ 82,700.0