Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENT - Carrying Values and Fair Values of Financial Assets Recorded at Fair Value on a Recurring Basis (Details)

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FAIR VALUE MEASUREMENT - Carrying Values and Fair Values of Financial Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value $ 363,932 $ 379,747  
Mortgage servicing rights, at fair value 5,538,815 5,686,233  
Mortgage servicing rights financing receivables, at fair value 1,604,431 1,718,273  
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 2,479,603 19,477,728  
Residential mortgage loans, held-for-sale 1,264,533 1,429,052  
Residential mortgage loans, held-for-sale, at fair value 3,283,973 4,613,612  
Residential mortgage loans, held-for-investment, at fair value 824,183 484,443  
Residential mortgage loans subject to repurchase 197,715 172,336 $ 140,135
Consumer loans, held-for-investment, at fair value 780,821 0  
Derivative assets 132,616 41,501  
Restricted cash 147,435 162,197  
Liabilities      
Residential mortgage loan repurchase liability 197,715 172,336  
Derivative liabilities 160,353 6,885  
Excess spread financing, at fair value 25,614 $ 31,777  
Recurring Basis      
Investments in:      
Excess mortgage servicing rights, principal balance 85,009,386    
Excess mortgage servicing rights, equity method investees, principal balance 33,251,300    
Mortgage servicing rights, principal balance 403,706,059    
Mortgage servicing rights financing receivables, principal balance 123,066,762    
Servicer advance investments, principal balance 461,723    
Real estate and other securities, available-for-sale, principal balance 20,834,705    
Residential mortgage loans, held-for-sale, principal 1,470,604    
Residential mortgage loans, held-for-sale, at fair value principal balance 3,476,667    
Residential mortgage loans, held-for-investment, at fair value, principal balance 919,461    
Residential mortgage loans, subject to repurchase, principal balance 197,715    
Consumer loans, held-for-investment, principal balance 771,998    
Derivative assets, principal balance 14,724,133    
Note receivable, private, principal balance 46,724    
Cash and cash equivalents, principal balance 360,453    
Restricted cash, principal balance 147,435    
Liabilities      
Repurchase agreements, principal balance 10,815,570    
Notes and bonds payable, principal balance 7,028,099    
Residential mortgage loan repurchase liability, principal balance 197,715    
Derivative liabilities, principal amount 18,169,875    
Excess spread financing, principal balance 2,839,463    
Mortgage backed securities, issued at fair value 272,300    
Recurring Basis | Carrying Value      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 363,932    
Excess mortgage servicing rights, equity method investees, at fair value 119,609    
Mortgage servicing rights, at fair value 3,934,384    
Mortgage servicing rights financing receivables, at fair value 1,604,431    
Servicer advance investments, at fair value 515,574    
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 2,479,603    
Residential mortgage loans, held-for-sale 1,264,533    
Residential mortgage loans, held-for-sale, at fair value 3,283,973    
Residential mortgage loans, held-for-investment, at fair value 824,183    
Residential mortgage loans subject to repurchase 197,715    
Consumer loans, held-for-investment, at fair value 780,821    
Derivative assets 132,616    
Note receivable 42,787    
Cash and cash equivalents 360,453    
Restricted cash 147,435    
Other assets 45,118    
Assets, fair value 16,097,167    
Liabilities      
Repurchase agreements 10,814,130    
Notes and bonds payable 7,014,579    
Residential mortgage loan repurchase liability 197,715    
Derivative liabilities 160,353    
Excess spread financing, at fair value 25,614    
Contingent consideration 56,836    
Liabilities, fair value 18,269,227    
Recurring Basis | Total      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 363,932    
Excess mortgage servicing rights, equity method investees, at fair value 119,609    
Mortgage servicing rights, at fair value 3,934,384    
Mortgage servicing rights financing receivables, at fair value 1,604,431    
Servicer advance investments, at fair value 515,574    
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 2,479,603    
Residential mortgage loans, held-for-sale 1,264,533    
Residential mortgage loans, held-for-sale, at fair value 3,283,973    
Residential mortgage loans, held-for-investment, at fair value 824,183    
Residential mortgage loans subject to repurchase 197,715    
Consumer loans, held-for-investment, at fair value 780,821    
Derivative assets 132,616    
Note receivable 42,787    
Cash and cash equivalents 360,453    
Restricted cash 147,435    
Other assets 45,118    
Assets, fair value 16,097,167    
Liabilities      
Repurchase agreements 10,815,570    
Notes and bonds payable 6,238,923    
Residential mortgage loan repurchase liability 197,715    
Derivative liabilities 160,353    
Excess spread financing, at fair value 25,614    
Contingent consideration 56,836    
Liabilities, fair value 17,495,011    
Recurring Basis | Total | Level 1      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 0    
Excess mortgage servicing rights, equity method investees, at fair value 0    
Mortgage servicing rights, at fair value 0    
Mortgage servicing rights financing receivables, at fair value 0    
Servicer advance investments, at fair value 0    
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 0    
Residential mortgage loans, held-for-sale 0    
Residential mortgage loans, held-for-sale, at fair value 0    
Residential mortgage loans, held-for-investment, at fair value 0    
Residential mortgage loans subject to repurchase 0    
Consumer loans, held-for-investment, at fair value 0    
Derivative assets 0    
Note receivable 0    
Cash and cash equivalents 360,453    
Restricted cash 147,435    
Other assets 2,902    
Assets, fair value 510,790    
Liabilities      
Repurchase agreements 0    
Notes and bonds payable 0    
Residential mortgage loan repurchase liability 0    
Derivative liabilities 0    
Excess spread financing, at fair value 0    
Contingent consideration 0    
Liabilities, fair value 0    
Recurring Basis | Total | Level 3      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 0    
Excess mortgage servicing rights, equity method investees, at fair value 0    
Mortgage servicing rights, at fair value 0    
Mortgage servicing rights financing receivables, at fair value 0    
Servicer advance investments, at fair value 0    
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 318,568    
Residential mortgage loans, held-for-sale 0    
Residential mortgage loans, held-for-sale, at fair value 1,633,481    
Residential mortgage loans, held-for-investment, at fair value 0    
Residential mortgage loans subject to repurchase 197,715    
Consumer loans, held-for-investment, at fair value 0    
Derivative assets 48    
Note receivable 0    
Cash and cash equivalents 0    
Restricted cash 0    
Other assets 0    
Assets, fair value 2,149,812    
Liabilities      
Repurchase agreements 10,815,570    
Notes and bonds payable 0    
Residential mortgage loan repurchase liability 197,715    
Derivative liabilities 158,925    
Excess spread financing, at fair value 0    
Contingent consideration 0    
Liabilities, fair value 11,172,210    
Recurring Basis | Total | Level 3      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 363,932    
Excess mortgage servicing rights, equity method investees, at fair value 119,609    
Mortgage servicing rights, at fair value 3,934,384    
Mortgage servicing rights financing receivables, at fair value 1,604,431    
Servicer advance investments, at fair value 515,574    
Real estate and other securities, available-for-sale (amortized cost $2,591,656 and $18,782,175 at March 31, 2020 and December 31, 2019, respectively; allowance for credit losses $44,149 at March 31, 2020) 2,161,035    
Residential mortgage loans, held-for-sale 1,264,533    
Residential mortgage loans, held-for-sale, at fair value 1,650,492    
Residential mortgage loans, held-for-investment, at fair value 824,183    
Residential mortgage loans subject to repurchase 0    
Consumer loans, held-for-investment, at fair value 780,821    
Derivative assets 132,568    
Note receivable 42,787    
Cash and cash equivalents 0    
Restricted cash 0    
Other assets 42,216    
Assets, fair value 13,436,565    
Liabilities      
Repurchase agreements 0    
Notes and bonds payable 6,238,923    
Residential mortgage loan repurchase liability 0    
Derivative liabilities 1,428    
Excess spread financing, at fair value 25,614    
Contingent consideration 56,836    
Liabilities, fair value 6,322,801    
Recurring Basis | Total | Fair Value Measured at Net Asset Value Per Share      
Investments in:      
Other assets $ 31,900