Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Information Regarding Inputs used in Valuing Excess MSRs Owned Directly and through Equity Method Investees (Details)

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FAIR VALUE MEASUREMENT - Information Regarding Inputs used in Valuing Excess MSRs Owned Directly and through Equity Method Investees (Details)
9 Months Ended
Sep. 30, 2018
$ / Loan
Agency | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 7.40
Non-Agency | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 11.52
Ginnie Mae | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 10.02
Prepayment Rate | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.093
Prepayment Rate | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.089
Prepayment Rate | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.092
Prepayment Rate | Non-Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.140
Prepayment Rate | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.084
Prepayment Rate | Ginnie Mae | MSRs  
Directly Held  
Servicing asset, measurement input 0.104
Prepayment Rate | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.094
Prepayment Rate | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.097
Prepayment Rate | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.074
Prepayment Rate | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.072
Prepayment Rate | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.088
Prepayment Rate | Directly Held | Non-Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.106
Prepayment Rate | Directly Held | Non-Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.091
Prepayment Rate | Directly Held | Non-Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.091
Prepayment Rate | Directly Held | Non-Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.103
Prepayment Rate | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.092
Prepayment Rate | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.108
Prepayment Rate | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.077
Prepayment Rate | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.078
Delinquency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.028
Delinquency | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.012
Delinquency | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.011
Delinquency | Non-Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.009
Delinquency | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.151
Delinquency | Ginnie Mae | MSRs  
Directly Held  
Servicing asset, measurement input 0.036
Delinquency | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.025
Delinquency | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.026
Delinquency | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.022
Delinquency | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.022
Delinquency | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.025
Delinquency | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.033
Delinquency | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.040
Delinquency | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.026
Delinquency | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.027
Recapture Rate | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.245
Recapture Rate | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.229
Recapture Rate | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.143
Recapture Rate | Non-Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.100
Recapture Rate | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.050
Recapture Rate | Ginnie Mae | MSRs  
Directly Held  
Servicing asset, measurement input 0.236
Recapture Rate | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.216
Recapture Rate | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.261
Recapture Rate | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.238
Recapture Rate | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.246
Recapture Rate | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.254
Recapture Rate | Directly Held | Non-Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.154
Recapture Rate | Directly Held | Non-Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.202
Recapture Rate | Directly Held | Non-Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.201
Recapture Rate | Directly Held | Non-Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.163
Recapture Rate | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.292
Recapture Rate | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.288
Recapture Rate | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.292
Recapture Rate | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.305
Servicing Amount Percent | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.002
Servicing Amount Percent | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.0026
Servicing Amount Percent | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.0027
Servicing Amount Percent | Non-Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.0026
Servicing Amount Percent | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.0045
Servicing Amount Percent | Ginnie Mae | MSRs  
Directly Held  
Servicing asset, measurement input 0.0034
Servicing Amount Percent | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.0019
Servicing Amount Percent | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.0021
Servicing Amount Percent | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.0022
Servicing Amount Percent | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.0022
Servicing Amount Percent | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.0021
Servicing Amount Percent | Directly Held | Non-Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.0015
Servicing Amount Percent | Directly Held | Non-Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.0023
Servicing Amount Percent | Directly Held | Non-Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.0020
Servicing Amount Percent | Directly Held | Non-Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.0016
Servicing Amount Percent | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.0021
Servicing Amount Percent | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.0019
Servicing Amount Percent | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.0023
Servicing Amount Percent | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.0023
Collateral Weighted Average Maturity (Years) | Excess MSRs | Weighted Average  
Directly Held  
Servicing asset, term 23 years
Collateral Weighted Average Maturity (Years) | Agency | MSRs | Weighted Average  
Directly Held  
Servicing asset, term 22 years
Collateral Weighted Average Maturity (Years) | Agency | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Servicing asset, term 20 years
Collateral Weighted Average Maturity (Years) | Non-Agency | MSRs | Weighted Average  
Directly Held  
Servicing asset, term 26 years
Collateral Weighted Average Maturity (Years) | Non-Agency | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Servicing asset, term 26 years
Collateral Weighted Average Maturity (Years) | Ginnie Mae | MSRs | Weighted Average  
Directly Held  
Servicing asset, term 27 years
Collateral Weighted Average Maturity (Years) | Directly Held | Excess MSRs | Weighted Average  
Directly Held  
Servicing asset, term 23 years
Collateral Weighted Average Maturity (Years) | Directly Held | Agency | Original Pools | Weighted Average  
Directly Held  
Servicing asset, term 22 years
Collateral Weighted Average Maturity (Years) | Directly Held | Agency | Recaptured Pools | Weighted Average  
Directly Held  
Servicing asset, term 24 years
Collateral Weighted Average Maturity (Years) | Directly Held | Agency | Excess MSRs | Weighted Average  
Directly Held  
Servicing asset, term 23 years
Collateral Weighted Average Maturity (Years) | Directly Held | Non-Agency | Original Pools | Weighted Average  
Directly Held  
Servicing asset, term 24 years
Collateral Weighted Average Maturity (Years) | Directly Held | Non-Agency | Recaptured Pools | Weighted Average  
Directly Held  
Servicing asset, term 24 years
Collateral Weighted Average Maturity (Years) | Directly Held | Non-Agency | Excess MSRs | Weighted Average  
Directly Held  
Servicing asset, term 24 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Excess MSRs | Weighted Average  
Directly Held  
Servicing asset, term 22 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Agency | Original Pools | Weighted Average  
Directly Held  
Servicing asset, term 21 years
Collateral Weighted Average Maturity (Years) | Held through Equity Method Investees | Agency | Recaptured Pools | Weighted Average  
Directly Held  
Servicing asset, term 23 years