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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value $ 1,099 $ 1,099
REO 3,120 3,120
Level 3    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value 1,099 1,099
REO 3,120 3,120
Residential Loans at Lower of Cost or Fair Value    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Gain (Loss) on assets measured at fair value on a non-recurring basis 1 2
REO    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Gain (Loss) on assets measured at fair value on a non-recurring basis $ (621) $ (748)