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Sales of Advances and MSRs - Narrative (Details) - NRZ [Member] - USD ($)
$ in Billions
Apr. 06, 2015
Dec. 31, 2016
Related Party Transaction [Line Items]    
UPB of rights to MSRs sold   $ 118.7
Outstanding servicing advances   $ 4.1
Period from sale of tranche of rights to mortgage servicing rights that apportionment of fees is subject to re-negotiation 8 years