Quarterly report pursuant to Section 13 or 15(d)

DEBT OBLIGATIONS - Schedule of Debt Obligations (Details)

v3.19.3
DEBT OBLIGATIONS - Schedule of Debt Obligations (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Outstanding Face Amount $ 30,524,956,000  
Carrying Value $ 30,516,231,000 $ 22,656,235,000
Weighted Average Funding Cost 3.08%  
Weighted Average Life (Years) 24 days  
MSR purchase price holdback $ 80,892,000 49,352,000
Agency RMBS | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 10,733,236,000  
Carrying Value $ 10,733,236,000 4,346,070,000
Weighted Average Funding Cost 2.31%  
Weighted Average Life (Years) 3 days  
Agency RMBS | Repurchase Agreements | Trade And Other Receivables    
Debt Instrument [Line Items]    
Collateral amount $ 4,400,000,000  
Agency RMBS | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 2 years 4 months 24 days  
Outstanding Face of Collateral $ 10,611,553,000  
Amortized Cost Basis of Collateral 10,825,984,000  
Carrying Value of Collateral 10,886,787,000  
Non-Agency RMBS | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 7,144,329,000  
Carrying Value $ 7,144,329,000 7,434,785,000
Weighted Average Funding Cost 3.08%  
Weighted Average Life (Years) 3 days  
Non-Agency RMBS | Repurchase Agreements | Retained Servicer Advance and Consumer Bonds    
Debt Instrument [Line Items]    
Carrying Value $ 7,500,000  
Non-Agency RMBS | Repurchase Agreements | Retainer Bonds Collateralized by Agency MSRs    
Debt Instrument [Line Items]    
Carrying Value $ 671,300,000  
Non-Agency RMBS | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 6 years 3 months 18 days  
Outstanding Face of Collateral $ 21,021,981,000  
Amortized Cost Basis of Collateral 7,113,471,000  
Carrying Value of Collateral 7,786,425,000  
Residential Mortgage | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 5,165,150,000  
Carrying Value $ 5,164,159,000 3,678,246,000
Weighted Average Funding Cost 3.74%  
Weighted Average Life (Years) 18 days  
Residential Mortgage | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 13 years 10 months 24 days  
Outstanding Face of Collateral $ 5,960,958,000  
Amortized Cost Basis of Collateral 6,025,596,000  
Carrying Value of Collateral 5,805,242,000  
Residential Mortgage | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 1,012,342,000  
Carrying Value $ 1,015,360,000 124,945,000
Weighted Average Funding Cost 4.09%  
Weighted Average Life (Years) 3 years 8 months 12 days  
Residential Mortgage | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 8 years  
Outstanding Face of Collateral $ 1,258,875,000  
Amortized Cost Basis of Collateral 1,277,193,000  
Carrying Value of Collateral 1,194,186,000  
Real Estate Owned | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 68,651,000  
Carrying Value $ 68,635,000 94,868,000
Weighted Average Funding Cost 3.85%  
Weighted Average Life (Years) 12 days  
Real Estate Owned | Repurchase Agreements | Collateral    
Debt Instrument [Line Items]    
Carrying Value of Collateral $ 95,410,000  
Total Repurchase Agreements | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 23,111,366,000  
Carrying Value $ 23,110,359,000 15,553,969,000
Weighted Average Funding Cost 2.87%  
Weighted Average Life (Years) 9 days  
MSR purchase price holdback $ 77,800,000  
Excess MSRs    
Debt Instrument [Line Items]    
Carrying Value 269,759,000 297,563,000
Excess MSRs | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 269,759,000  
Carrying Value $ 269,759,000 297,563,000
Weighted Average Funding Cost 4.95%  
Weighted Average Life (Years) 1 year 10 months 24 days  
Excess MSRs | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 5 years 9 months 18 days  
Outstanding Face of Collateral $ 103,514,484,000  
Amortized Cost Basis of Collateral 315,847,000  
Carrying Value of Collateral 416,899,000  
MSRs | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 2,360,182,000  
Carrying Value $ 2,352,961,000 2,360,856,000
Weighted Average Funding Cost 4.23%  
Weighted Average Life (Years) 2 years  
MSRs | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 5 years 6 months  
Outstanding Face of Collateral $ 452,215,330,000  
Amortized Cost Basis of Collateral 4,718,333,000  
Carrying Value of Collateral 5,113,271,000  
Servicer Advances    
Debt Instrument [Line Items]    
Carrying Value 2,896,819,000 3,382,455,000
Servicer Advances | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 2,903,093,000  
Carrying Value $ 2,896,819,000 3,382,455,000
Weighted Average Funding Cost 3.22%  
Weighted Average Life (Years) 2 years  
Face amount of debt at fixed rate $ 2,600,000,000  
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 1.99%  
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 $ 3,316,416,000  
Amortized Cost Basis of Collateral 3,482,368,000  
Carrying Value of Collateral 3,512,345,000  
Consumer Loans    
Debt Instrument [Line Items]    
Carrying Value 870,973,000 936,447,000
Consumer Loans | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 868,214,000  
Carrying Value $ 870,973,000 936,447,000
Weighted Average Funding Cost 3.25%  
Weighted Average Life (Years) 4 years  
Consumer Loans | Notes and Bonds Payable | Collateral    
Debt Instrument [Line Items]    
Weighted Average Life (Years) 5 years 7 months 6 days  
Outstanding Face of Collateral $ 878,317,000  
Amortized Cost Basis of Collateral 884,473,000  
Carrying Value of Collateral 881,069,000  
Total Notes Payable | Notes and Bonds Payable    
Debt Instrument [Line Items]    
Outstanding Face Amount 7,413,590,000  
Carrying Value $ 7,405,872,000 $ 7,102,266,000
Weighted Average Funding Cost 3.73%  
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 $ 6,585,600,000  
Non-agency RMBS Repurchase Agreements, Fixed Rate | Repurchase Agreements    
Debt Instrument [Line Items]    
Outstanding Face Amount 558,800,000  
Corporate Note, LIBOR Based Floating Interest Rate | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount 169,800,000  
3.00% Secured Corporate Note | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 100,000,000.0  
3.00% Secured Corporate Note | Secured Debt | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate spread 3.00%  
2.50% Secured Corporate Note | Secured Debt | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate spread 2.50%  
2.25% Agency MSR Secured Note | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 940,200,000  
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 $ 1,419,900,000  
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 4.62%  
2.88% Residential Mortgage Loans | Notes and Bonds Payable | Nationstar    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 6,000,000.0  
Collateral amount $ 1,500,000  
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 $ 109,900,000  
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 $ 362,100,000  
Weighted Average Funding Cost 4.59%  
Asset-backed Notes, LIBOR Based Floating Interest Rate | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 535,100,000  
Collateral amount $ 1,300,000  
Asset-backed Notes, LIBOR Based Floating Interest Rate | Secured Debt | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Variable interest rate spread 1.25%  
Consumer Loan, UPB Class A | Secured Debt    
Debt Instrument [Line Items]    
UPB of Underlying Mortgages $ 787,900,000  
Interest rate, stated percentage 3.20%  
Consumer Loan, UPB Class B | Secured Debt    
Debt Instrument [Line Items]    
UPB of Underlying Mortgages $ 70,400,000  
Interest rate, stated percentage 3.58%  
Consumer Loan, UPB Class C-1 | Secured Debt    
Debt Instrument [Line Items]    
UPB of Underlying Mortgages $ 8,700,000  
Interest rate, stated percentage 5.06%  
4.00% Consumer Loans | Secured Debt    
Debt Instrument [Line Items]    
Outstanding Face Amount $ 1,200,000  
Interest rate, stated percentage 4.00%