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Residential Loans at Amortized Cost, Net - Schedule of Residential Loans at Amortized Cost, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Feb. 09, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unpaid principal balance $ 481,050   $ 1,021,172  
Unamortized discounts and other cost basis adjustments, net (6,230)   (29,371)  
Allowance for loan losses (940) $ (681) (6,347) $ (5,167)
Residential loans at amortized cost, net 473,880   985,454  
Loans subject to repurchase from Ginnie Mae 466,500   542,400  
Residential Loans At Amortized Cost, Net [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accrued interest receivable $ 100   4,500  
Mortgage Loans Not Related to Consolidated VIEs [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Residential loans at amortized cost, net     $ 561,000