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)
6 Months Ended
Jun. 30, 2018
$ / Loan
Agency | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 7.43
Non-Agency | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 11.84
Ginnie Mae | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Monthly cost per loan (in dollars per loan) 9.63
Prepayment Rate | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.095
Prepayment Rate | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.093
Prepayment Rate | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.092
Prepayment Rate | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.095
Prepayment Rate | Ginnie Mae | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.119
Prepayment Rate | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.096
Prepayment Rate | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.095
Prepayment Rate | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.078
Prepayment Rate | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.073
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 0.116
Prepayment Rate | Directly Held | Non-Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.067
Prepayment Rate | Directly Held | Non-Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.067
Prepayment Rate | Directly Held | Non-Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.107
Prepayment Rate | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.093
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 0.079
Prepayment Rate | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.079
Delinquency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.039
Delinquency | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.013
Delinquency | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.012
Delinquency | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.150
Delinquency | Ginnie Mae | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.052
Delinquency | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.034
Delinquency | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.029
Delinquency | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.044
Delinquency | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.044
Delinquency | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.034
Delinquency | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.047
Delinquency | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.048
Delinquency | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.046
Delinquency | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.046
Recapture Rate | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.266
Recapture Rate | Agency | MSRs  
Directly Held  
Servicing asset, measurement input 0.238
Recapture Rate | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.139
Recapture Rate | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.050
Recapture Rate | Ginnie Mae | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.308
Recapture Rate | Directly Held | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.240
Recapture Rate | Directly Held | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.305
Recapture Rate | Directly Held | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.267
Recapture Rate | Directly Held | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.264
Recapture Rate | Directly Held | Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.291
Recapture Rate | Directly Held | Non-Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.153
Recapture Rate | Directly Held | Non-Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.198
Recapture Rate | Directly Held | Non-Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.197
Recapture Rate | Directly Held | Non-Agency | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.161
Recapture Rate | Held through Equity Method Investees | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.308
Recapture Rate | Held through Equity Method Investees | Agency | Original Pools  
Directly Held  
Servicing asset, measurement input 0.324
Recapture Rate | Held through Equity Method Investees | Agency | Recaptured Pools  
Directly Held  
Servicing asset, measurement input 0.293
Recapture Rate | Held through Equity Method Investees | Agency | Recapture Agreements  
Directly Held  
Servicing asset, measurement input 0.292
Servicing Amount Percent | Excess MSRs  
Directly Held  
Servicing asset, measurement input 0.002
Servicing Amount Percent | MSRs  
Directly Held  
Servicing asset, measurement input 0.0027
Servicing Amount Percent | Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.0027
Servicing Amount Percent | Non-Agency | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.0045
Servicing Amount Percent | Ginnie Mae | Mortgage Servicing Rights Financing Receivables  
Directly Held  
Servicing asset, measurement input 0.0027
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 0.0021
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 0.0022
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 | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Servicing asset, term 26 years
Collateral Weighted Average Maturity (Years) | Ginnie Mae | Mortgage Servicing Rights Financing Receivables | Weighted Average  
Directly Held  
Servicing asset, term 28 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 24 years