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Subsequent Events - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 27, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 20, 2020
Feb. 03, 2020
Jul. 01, 2019
Oct. 04, 2018
Subsequent Event [Line Items]                    
Maximum borrowing capacity                 $ 300,000,000  
UPB of rights to MSRs sold     $ 76,100,000,000 $ 76,100,000,000            
Service fee collected on behalf of counterparty       577,015,000 $ 539,039,000 $ 549,411,000        
Other financing liabilities     972,595,000 $ 972,595,000 1,062,090,000          
Subsequent Event                    
Subsequent Event [Line Items]                    
Stock repurchase program, authorized aggregate amount               $ 5,000,000    
Estimated deboarding fees receivable             $ 6,100,000      
Senior Secured Term Loan                    
Subsequent Event [Line Items]                    
Periodic prepayment of SSTL   $ 4,200,000 6,400,000              
Senior Secured Term Loan | Secured Debt | Subsequent Event                    
Subsequent Event [Line Items]                    
Repayments of debt $ 126,100,000                  
Maximum borrowing capacity $ 200,000,000.0                  
Debt instrument, prepayment premium until January 27, 2022 (percentage) 2.00%                  
Periodic prepayment of SSTL $ 5,000,000.0                  
Eurodollar | Senior Secured Term Loan | Secured Debt                    
Subsequent Event [Line Items]                    
Basis spread on variable rate (percentage)       5.00%            
Until January 27, 2021 | Eurodollar | Senior Secured Term Loan | Secured Debt | Subsequent Event                    
Subsequent Event [Line Items]                    
Basis spread on variable rate (percentage) 6.00%                  
Until January 27, 2021 | Base Rate | Senior Secured Term Loan | Secured Debt | Subsequent Event                    
Subsequent Event [Line Items]                    
Basis spread on variable rate (percentage) 5.00%                  
Subsequent to January 27, 2021 | Eurodollar | Senior Secured Term Loan | Secured Debt | Subsequent Event                    
Subsequent Event [Line Items]                    
Basis spread on variable rate (percentage) 6.50%                  
Subsequent to January 27, 2021 | Base Rate | Senior Secured Term Loan | Secured Debt | Subsequent Event                    
Subsequent Event [Line Items]                    
Basis spread on variable rate (percentage) 5.50%                  
NRZ                    
Subsequent Event [Line Items]                    
UPB of rights to MSRs sold     18,500,000,000 $ 18,500,000,000            
PHH Corporation                    
Subsequent Event [Line Items]                    
Service fee collected on behalf of counterparty       28,800,000 $ 7,400,000          
PHH Corporation | NRZ                    
Subsequent Event [Line Items]                    
UPB of rights to MSRs sold     35,500,000,000 35,500,000,000            
Unpaid principal balance on servicing assets acquired                   $ 42,300,000,000
PHH Corporation | NRZ | Subsequent Event                    
Subsequent Event [Line Items]                    
UPB of rights to MSRs sold             $ 42,100,000,000      
NRZ | Unrelated Party                    
Subsequent Event [Line Items]                    
Unpaid principal balance on servicing assets acquired     $ 6,600,000,000 $ 6,600,000,000            
Servicing Portfolio | Customer Concentration Risk | NRZ                    
Subsequent Event [Line Items]                    
Concentration risk (percentage)       20.00%            
Servicing Portfolio | Customer Concentration Risk | NRZ | Subsequent Event                    
Subsequent Event [Line Items]                    
Percentage of initial mortgage loans (percentage)             25.00%      
Loan Servicing And Subservicing Fees | Customer Concentration Risk | NRZ                    
Subsequent Event [Line Items]                    
Concentration risk (percentage)       4.00%            
Total Assets | Customer Concentration Risk | NRZ                    
Subsequent Event [Line Items]                    
Concentration risk (percentage)       3.00%