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Loans Held For Investment, Loans Held For Sale, Notes, Certificates and Secured Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2019
May 31, 2019
Jun. 30, 2018
Dec. 31, 2017
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Net interest income $ (8,868) $ 5,318 $ (29,113) $ 4,086          
Loans Held For Sale                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Loans derecognized in deconsolidation of securitization             $ 236,300    
Loans and Loans Held for Sale                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Nonaccrual policy     90 days            
Loans Invested in by Company                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Loans hed for investment and loans held for sale, fair value 714,381 471,481 $ 714,381 471,481 $ 842,604 $ 440,110   $ 524,928 $ 597,055
Net change in fair value recorded in earnings on loans invested in by the Company (32,419) (20,479) (100,127) (75,497)          
Outstanding Principal Balance, Purchases 1,532,707 1,191,258 3,566,428 3,177,500          
Outstanding Principal Balance, Sales 1,181,739 1,193,980 3,477,485 3,119,245          
Outstanding Principal Balance, Principal payments and retirements (66,654) $ (46,721) (199,987) $ (166,734)          
Fair Value, Measurements, Recurring | Loans Invested in by Company                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Fair value adjustments     (26,566)   (30,629)        
Net interest income 17,700   59,300            
Aggregate principal balance outstanding 740,947   740,947   873,233        
Fair value of loans invested in by the Company 714,381   714,381   842,604        
Fair Value, Measurements, Recurring | Loans Invested in by Company | Loans Held For Sale                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Fair value adjustments     (25,181)   (29,694)        
Aggregate principal balance outstanding 735,351   735,351   869,715        
Whole Loan Investors | Loans Invested in by Company                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Outstanding Principal Balance, Principal payments and retirements (300,000)   (700,000)            
Secured Borrowings | Loans Held for Investment                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Loans pledged as collateral 27,400   27,400   76,500        
Loans pledged as collateral for secured borrowings 27,400   27,400   76,500        
Revolving Credit Facility | Warehouse Credit Facilities | Loans Held For Sale                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Loans pledged as collateral 600,000   600,000   453,000        
Personal whole loans | Loans Invested in by Company                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Securities issued in securitization transaction, aggregate value $ 900,000   $ 2,800,000            
Loans Related to Consolidation of Securitization Trust | Consolidated VIEs | Loans Invested in by Company                  
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]                  
Loans hed for investment and loans held for sale, fair value         $ 286,300