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Real Estate Securities - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Investment
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Investment
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Investment
Investment Holdings [Line Items]          
Trading securities $ 116,141,000   $ 116,141,000   $ 111,606,000
Trading securities acquired 71,000,000   94,000,000    
Trading securities sold 35,000,000   37,000,000    
Adjustment to valuation of trading securities (7,000,000) $ (9,000,000) (7,000,000) $ (13,000,000)  
Available-for-sale securities purchased 5,000,000 77,000,000 15,000,000    
Available-for-sale securities sold 112,000,000 1,000,000 202,000,000    
Gross realized gains $ 5,956,000 $ 992,000 $ 10,262,000 $ 992,000  
Number of AFS securities | Investment 260   260   290
Number of securities in unrealized loss position | Investment 29   29   31
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment 13   13   10
OTTI losses on AFS securities $ 0   $ 0    
Senior Securities          
Investment Holdings [Line Items]          
Trading securities 69,132,000   69,132,000   $ 101,753,000
Interest Only Securities          
Investment Holdings [Line Items]          
Trading securities 47,000,000   47,000,000    
Residential Senior Securities          
Investment Holdings [Line Items]          
Trading securities 22,000,000   22,000,000    
Residential Subordinate Securities          
Investment Holdings [Line Items]          
Trading securities 47,000,000   47,000,000    
Trading Securities | Residential Senior Securities          
Investment Holdings [Line Items]          
Unpaid principal balance 23,000,000   23,000,000    
Trading Securities | Residential Subordinate Securities          
Investment Holdings [Line Items]          
Unpaid principal balance 61,000,000   61,000,000    
Prime | Senior Securities          
Investment Holdings [Line Items]          
Trading securities 62,427,000   62,427,000   93,802,000
Securities financed through non-recourse resecuritization entity 88,000,000   88,000,000   105,000,000
Non-prime | Senior Securities          
Investment Holdings [Line Items]          
Trading securities 6,705,000   6,705,000   7,951,000
Securities financed through non-recourse resecuritization entity 107,000,000   107,000,000   $ 117,000,000
Residential          
Investment Holdings [Line Items]          
Loan pledged as collateral 535,000,000   535,000,000    
Marketable securities, less than five years 6,000,000   6,000,000    
Marketable securities, due from five to ten years $ 2,000,000   $ 2,000,000