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Sales of Advances and MSRs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Servicing Assets at Fair Value [Line Items]    
UPB of MSRs sold $ 52.2 $ 34.5
NRZ [Member]    
Servicing Assets at Fair Value [Line Items]    
UPB of rights to MSRs sold 114,300.0  
Outstanding servicing advances $ 3,700.0  
Period from sale of tranche of rights to mortgage servicing rights that apportionment of fees is subject to re-negotiation 8 years