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Commitments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]        
Threshold of outstanding principal balance on maximum claim amount (as a percent) 98.00%      
MSRs, at fair value $ 1,050,228 $ 1,400,191 $ 1,486,395 $ 1,457,149
MSRs 1,050,228   1,486,395  
Servicing and subservicing fees 211,483 256,616    
Other financing liabilities 623,049   972,595  
Floating Rate Reverse Mortgage Loans [Member]        
Other Commitments [Line Items]        
Additional borrowing capacity to borrowers 1,600,000      
Forward Mortgage Loan Interest Rate Lock Commitments [Member]        
Other Commitments [Line Items]        
Short-term commitments to lend 357,200      
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]        
Other Commitments [Line Items]        
Short-term commitments to lend 25,600      
New Residential Investment Corp        
Other Commitments [Line Items]        
MSRs, at fair value 591,700   915,148  
Net servicing fees remitted to NRZ 90,338 118,440    
Servicing fees retained $ 29,331 $ 37,407    
Customer Concentration Risk | Unpaid Principal Balance | New Residential Investment Corp        
Other Commitments [Line Items]        
Concentration risk (percent) 55.00%      
Customer Concentration Risk | Servicing Portfolio | New Residential Investment Corp        
Other Commitments [Line Items]        
Concentration risk (percent) 19.00%      
Customer Concentration Risk | Loan Count [Member] | New Residential Investment Corp        
Other Commitments [Line Items]        
Concentration risk (percent) 60.00%      
Customer Concentration Risk | Delinquent Loans [Member] | New Residential Investment Corp        
Other Commitments [Line Items]        
Concentration risk (percent) 72.00%      
2017 Agreements and New RMSR Agreements | New Residential Investment Corp        
Other Commitments [Line Items]        
Other financing liabilities $ 10,000   $ 35,445