Quarterly report pursuant to Section 13 or 15(d)

DEBT OBLIGATIONS - Schedule of Debt Obligations (Details)

v3.19.1
DEBT OBLIGATIONS - Schedule of Debt Obligations (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Outstanding Face Amount $ 25,408,281,000  
Carrying Value $ 25,393,908,000 $ 22,656,235,000
Weighted Average Funding Cost 3.53%  
Weighted Average Life (Years) 27 days  
MSR purchase price holdback $ 66,510,000 49,352,000
UPB of Underlying Mortgages 21,900,000,000  
Agency RMBS | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 7,271,582,000  
Carrying Value $ 7,271,582,000 4,346,070,000
Weighted Average Funding Cost 2.67%  
Weighted Average Life (Years) 3 days  
Agency RMBS | Repurchase Agreements | Trade And Other Receivables    
Debt Instrument [Line Items]    
Collateral amount $ 7,000,000,000.0  
Agency RMBS | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 15 days  
Outstanding Face of Collateral $ 7,368,726,000  
Amortized Cost Basis of Collateral 7,510,370,000  
Carrying Value of Collateral 7,586,872,000  
Non-Agency RMBS | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 7,429,095,000  
Carrying Value $ 7,428,992,000 7,434,785,000
Weighted Average Funding Cost 3.61%  
Weighted Average Life (Years) 3 days  
Non-Agency RMBS | Repurchase Agreements | Retained Servicer Advance and Consumer Bonds    
Debt Instrument [Line Items]    
Carrying Value $ 170,900,000  
Non-Agency RMBS | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 7 years  
Outstanding Face of Collateral $ 19,832,039,000  
Amortized Cost Basis of Collateral 8,309,648,000  
Carrying Value of Collateral 8,870,630,000  
Residential Mortgage | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 3,650,367,000  
Carrying Value $ 3,649,371,000 3,678,246,000
Weighted Average Funding Cost 4.32%  
Weighted Average Life (Years) 21 days  
Residential Mortgage | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 13 years 1 month 6 days  
Outstanding Face of Collateral $ 4,364,713,000  
Amortized Cost Basis of Collateral 4,147,040,000  
Carrying Value of Collateral 4,160,896,000  
Residential Mortgage | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 498,044,000  
Carrying Value $ 498,065,000 122,465,000
Weighted Average Funding Cost 4.33%  
Weighted Average Life (Years) 5 years 6 months  
Residential Mortgage | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 9 years  
Outstanding Face of Collateral $ 585,985,000  
Amortized Cost Basis of Collateral 583,180,000  
Carrying Value of Collateral 551,641,000  
Real Estate Owned | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 91,891,000  
Carrying Value $ 91,861,000 94,868,000
Weighted Average Funding Cost 4.68%  
Weighted Average Life (Years) 15 days  
Real Estate Owned | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Carrying Value of Collateral $ 107,693,000  
Real Estate Owned | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 1,800,000  
Carrying Value $ 1,800,000 2,480,000
Weighted Average Funding Cost 5.11%  
Weighted Average Life (Years) 3 days  
Real Estate Owned | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Carrying Value of Collateral $ 1,260,000  
Total Repurchase Agreements | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 18,442,935,000  
Carrying Value $ 18,441,806,000 15,553,969,000
Weighted Average Funding Cost 3.38%  
Weighted Average Life (Years) 6 days  
MSR purchase price holdback $ 78,400,000  
Excess MSRs    
Debt Instrument [Line Items]    
Carrying Value 197,563,000 297,563,000
Excess MSRs | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 197,759,000  
Carrying Value $ 197,563,000 297,563,000
Weighted Average Funding Cost 5.48%  
Weighted Average Life (Years) 3 years 3 months 18 days  
Excess MSRs | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 5 years 7 months 6 days  
Outstanding Face of Collateral $ 115,570,597,000  
Amortized Cost Basis of Collateral 350,562,000  
Carrying Value of Collateral 460,570,000  
MSRs | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 2,303,925,000  
Carrying Value $ 2,296,562,000 2,360,856,000
Weighted Average Funding Cost 4.33%  
Weighted Average Life (Years) 2 years 9 months 18 days  
MSRs | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 6 years 6 months  
Outstanding Face of Collateral $ 386,224,299,000  
Amortized Cost Basis of Collateral 3,883,857,000  
Carrying Value of Collateral 4,573,349,000  
Servicer Advances    
Debt Instrument [Line Items]    
Carrying Value 3,086,534,000 3,382,455,000
Servicer Advances | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 3,089,398,000  
Carrying Value $ 3,086,534,000 3,382,455,000
Weighted Average Funding Cost 3.57%  
Weighted Average Life (Years) 1 year 8 months 12 days  
Face amount of debt at fixed rate $ 2,800,000,000  
Servicer Advances | Notes and Bonds Payable | London Interbank Offered Rate (LIBOR) | Minimum    
Debt Instrument [Line Items]    
Variable interest rate spread 1.15%  
Servicer Advances | Notes and Bonds Payable | London Interbank Offered Rate (LIBOR) | Maximum    
Debt Instrument [Line Items]    
Variable interest rate spread 2.15%  
Servicer Advances | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 1 year 7 months 6 days  
Outstanding Face of Collateral $ 3,527,120,000  
Amortized Cost Basis of Collateral 3,712,371,000  
Carrying Value of Collateral 3,734,320,000  
Consumer Loans    
Debt Instrument [Line Items]    
Carrying Value 871,578,000 936,447,000
Consumer Loans | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 874,420,000  
Carrying Value $ 871,578,000 936,447,000
Weighted Average Funding Cost 3.42%  
Weighted Average Life (Years) 2 years 8 months 12 days  
Consumer Loans | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 3 years 6 months  
Outstanding Face of Collateral $ 1,005,605,000  
Amortized Cost Basis of Collateral 1,010,265,000  
Carrying Value of Collateral 1,005,519,000  
Total Notes Payable | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 6,965,346,000  
Carrying Value $ 6,952,102,000 $ 7,102,266,000
Weighted Average Funding Cost 3.91%  
Weighted Average Life (Years) 2 years 6 months  
Non-agency RMBS Repurchase Agreements, LIBOR Based Floating Interest Rate | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 6,792,400,000  
Non-agency RMBS Repurchase Agreements, Fixed Rate | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 636,700,000  
3.00% Secured Corporate Note | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 197,800,000  
3.00% Secured Corporate Note | Secured Debt | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate spread 3.00%  
2.25% Agency MSR Secured Note | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 689,000,000.0  
2.25% Agency MSR Secured Note | Secured Debt | London Interbank Offered Rate (LIBOR) | Minimum    
Debt Instrument [Line Items]    
Variable interest rate spread 2.25%  
2.25% Agency MSR Secured Note | Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum    
Debt Instrument [Line Items]    
Variable interest rate spread 2.75%  
3.55% Corporate Note | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 1,614,900,000  
3.55% Corporate Note | Secured Debt | London Interbank Offered Rate (LIBOR) | Minimum    
Debt Instrument [Line Items]    
Variable interest rate spread 3.55%  
3.55% Corporate Note | Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum    
Debt Instrument [Line Items]    
Variable interest rate spread 4620.00%  
2.88% Residential Mortgage Loans | Notes and Bonds Payable | Nationstar    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 6,400,000  
2.88% Residential Mortgage Loans | Notes and Bonds Payable | London Interbank Offered Rate (LIBOR) | Nationstar    
Debt Instrument [Line Items]    
Variable interest rate spread 2.88%  
Non-Agency RMBS | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 116,100,000  
Non-Agency RMBS | Notes and Bonds Payable | Minimum    
Debt Instrument [Line Items]    
Weighted Average Funding Cost 3.50%  
Non-Agency RMBS | Notes and Bonds Payable | Maximum    
Debt Instrument [Line Items]    
Weighted Average Funding Cost 3.76%  
4.59% Asset-backed Notes | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 377,400,000  
Weighted Average Funding Cost 4.59%  
Consumer Loan, UPB Class A | Secured Debt    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.05%  
UPB of Underlying Mortgages $ 633,400,000  
Consumer Loan, UPB Class B | Secured Debt    
Debt Instrument [Line Items]    
Interest rate, stated percentage 4.10%  
UPB of Underlying Mortgages $ 210,800,000  
Consumer Loan, UPB Class C-1 | Secured Debt    
Debt Instrument [Line Items]    
Interest rate, stated percentage 5.63%  
UPB of Underlying Mortgages $ 18,300,000  
Consumer Loan, UPB Class C-2 | Secured Debt    
Debt Instrument [Line Items]    
Interest rate, stated percentage 5.63%  
UPB of Underlying Mortgages $ 18,300,000  
4.00% Consumer Loans | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 13,400,000  
Interest rate, stated percentage 4.00%