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, 2019
Dec. 31, 2018
Mar. 31, 2018
Investments in:      
Excess mortgage servicing rights, at fair value $ 436,137 $ 447,860  
Mortgage servicing rights financing receivables, at fair value 1,717,872 1,644,504  
Real estate and other securities, available-for-sale 9,747,450 11,636,581  
Residential mortgage loans, held-for-sale 3,204,322 2,808,529  
Residential mortgage loans, held-for-investment, at fair value 119,512 121,088  
Residential mortgage loans subject to repurchase 140,135 121,602 $ 0
Derivative assets 14,783 10,893  
Restricted cash 168,128 164,020  
Liabilities      
Residential mortgage loans repurchase liability 140,135 121,602  
Derivative liabilities 69,382 29,389  
Excess spread financing, at fair value 37,787 39,304  
Equity investment 74,249 $ 74,323  
Recurring Basis      
Investments in:      
Excess mortgage servicing rights, principal balance 103,027,952    
Excess mortgage servicing rights, equity method investees, principal balance 40,610,966    
Mortgage servicing rights, principal balance 264,204,829    
Mortgage servicing rights financing receivables, principal balance 135,313,045    
Servicer advance investments, principal balance 578,876    
Real estate and other securities, available-for-sale, principal balance 21,825,616    
Residential mortgage loans, held-for-investment, principal balance 636,385    
Residential mortgage loans, held-for-sale, principal balance 1,108,935    
Residential mortgage loans, held-for-sale, at fair value principal balance 3,286,151    
Residential mortgage loans, held-for-investment, at fair value, principal balance 120,195    
Residential mortgage loans, subject to repurchase, principal balance 140,135    
Consumer loans, held-for-investment, principal balance 1,005,746    
Derivative assets 5,394,729    
Cash and cash equivalents, principal balance 340,911    
Restricted cash, principal balance 168,128    
Liabilities      
Repurchase agreements, principal balance 18,442,935    
Notes and bonds payable, principal balance 6,965,346    
Residential mortgage loan repurchase liability, principal balance 140,135    
Derivative liabilities, principal amount 15,444,470    
Excess spread financing, principal balance 3,405,832    
Recurring Basis | Carrying Value      
Investments in:      
Excess mortgage servicing rights, at fair value 436,137    
Excess mortgage servicing rights, equity method investees, at fair value 143,200    
Mortgage servicing rights, at fair value 3,017,453    
Mortgage servicing rights financing receivables, at fair value 1,717,872    
Servicer advance investments, at fair value 697,628    
Real estate and other securities, available-for-sale 9,747,450    
Residential mortgage loans, held-for-investment 552,838    
Residential mortgage loans, held-for-sale 997,164    
Residential mortgage loans, held-for-sale 3,204,322    
Residential mortgage loans, held-for-investment, at fair value 119,512    
Residential mortgage loans subject to repurchase 140,135    
Consumer loans, held-for-investment 1,005,660    
Derivative assets 14,783    
Cash and cash equivalents 340,911    
Restricted cash 168,128    
Other assets(B) 23,840    
Assets, fair value 22,327,033    
Liabilities      
Repurchase agreements 18,441,806    
Notes and bonds payable 6,952,102    
Residential mortgage loans repurchase liability 140,135    
Derivative liabilities 69,382    
Excess spread financing, at fair value 37,787    
Contingent consideration 42,887    
Liabilities, fair value 25,684,099    
Recurring Basis | Fair Value      
Investments in:      
Excess mortgage servicing rights, at fair value 436,137    
Excess mortgage servicing rights, equity method investees, at fair value 143,200    
Mortgage servicing rights, at fair value 3,017,453    
Mortgage servicing rights financing receivables, at fair value 1,717,872    
Servicer advance investments, at fair value 697,628    
Real estate and other securities, available-for-sale 9,747,450    
Residential mortgage loans, held-for-investment 554,459    
Residential mortgage loans, held-for-sale 1,017,641    
Residential mortgage loans, held-for-sale 3,204,322    
Residential mortgage loans, held-for-investment, at fair value 119,512    
Residential mortgage loans subject to repurchase 140,135    
Consumer loans, held-for-investment 989,417    
Derivative assets 14,783    
Cash and cash equivalents 340,911    
Restricted cash 168,128    
Other assets(B) 23,840    
Assets, fair value 22,332,888    
Liabilities      
Repurchase agreements 18,442,935    
Notes and bonds payable 6,633,498    
Residential mortgage loans repurchase liability 140,135    
Derivative liabilities 69,382    
Excess spread financing, at fair value 37,787    
Contingent consideration 42,887    
Liabilities, fair value 25,366,624    
Recurring Basis | Fair Value | Level 1      
Investments in:      
Excess mortgage servicing rights, 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 0    
Residential mortgage loans, held-for-investment 0    
Residential mortgage loans, held-for-sale 0    
Residential mortgage loans, held-for-sale 0    
Residential mortgage loans, held-for-investment, at fair value 0    
Residential mortgage loans subject to repurchase 0    
Consumer loans, held-for-investment 0    
Derivative assets 0    
Cash and cash equivalents 340,911    
Restricted cash 168,128    
Other assets(B) 10,564    
Assets, fair value 519,603    
Liabilities      
Repurchase agreements 0    
Notes and bonds payable 0    
Residential mortgage loans repurchase liability 0    
Derivative liabilities 0    
Excess spread financing, at fair value 0    
Contingent consideration 0    
Liabilities, fair value 0    
Recurring Basis | Fair Value | Level 2      
Investments in:      
Excess mortgage servicing rights, 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 810,124    
Residential mortgage loans, held-for-investment 0    
Residential mortgage loans, held-for-sale 0    
Residential mortgage loans, held-for-sale 371,710    
Residential mortgage loans, held-for-investment, at fair value 0    
Residential mortgage loans subject to repurchase 140,135    
Consumer loans, held-for-investment 0    
Derivative assets 209    
Cash and cash equivalents 0    
Restricted cash 0    
Other assets(B) 0    
Assets, fair value 1,322,178    
Liabilities      
Repurchase agreements 18,442,935    
Notes and bonds payable 0    
Residential mortgage loans repurchase liability 140,135    
Derivative liabilities 68,642    
Excess spread financing, at fair value 0    
Contingent consideration 0    
Liabilities, fair value 18,651,712    
Recurring Basis | Fair Value | Level 3      
Investments in:      
Excess mortgage servicing rights, at fair value 436,137    
Excess mortgage servicing rights, equity method investees, at fair value 143,200    
Mortgage servicing rights, at fair value 3,017,453    
Mortgage servicing rights financing receivables, at fair value 1,717,872    
Servicer advance investments, at fair value 697,628    
Real estate and other securities, available-for-sale 8,937,326    
Residential mortgage loans, held-for-investment 554,459    
Residential mortgage loans, held-for-sale 1,017,641    
Residential mortgage loans, held-for-sale 2,832,612    
Residential mortgage loans, held-for-investment, at fair value 119,512    
Residential mortgage loans subject to repurchase 0    
Consumer loans, held-for-investment 989,417    
Derivative assets 14,574    
Cash and cash equivalents 0    
Restricted cash 0    
Other assets(B) 13,276    
Assets, fair value 20,491,107    
Liabilities      
Repurchase agreements 0    
Notes and bonds payable 6,633,498    
Residential mortgage loans repurchase liability 0    
Derivative liabilities 740    
Excess spread financing, at fair value 37,787    
Contingent consideration 42,887    
Liabilities, fair value $ 6,714,912