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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 - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value $ 1,096 $ 1,104
REO 2,395 2,069
Guarantee obligation 4,414 7,201
Level 3    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Residential loans, at lower of cost or fair value 1,096 1,104
REO 2,395 2,069
Guarantee obligation 4,414 7,201
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 3 (1)
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 $ (764) $ (320)