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Real Estate Securities - Available for Sale Securities by Collateral Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investment Holdings [Line Items]    
Available-for-sale securities $ 971,013 $ 1,267,624
Senior Securities    
Investment Holdings [Line Items]    
Available-for-sale securities 409,313 487,557
Senior Securities | Prime    
Investment Holdings [Line Items]    
Available-for-sale securities 251,273 307,813
Senior Securities | Non-prime    
Investment Holdings [Line Items]    
Available-for-sale securities 158,040 179,744
Re-REMIC    
Investment Holdings [Line Items]    
Available-for-sale securities 167,639 168,347
Subordinate Securities    
Investment Holdings [Line Items]    
Available-for-sale securities 394,061 611,720
Subordinate Securities | Prime    
Investment Holdings [Line Items]    
Available-for-sale securities 233,458 448,838
Subordinate Securities | Non-prime    
Investment Holdings [Line Items]    
Available-for-sale securities 1,000 1,000
Subordinate Securities | Subordinate    
Investment Holdings [Line Items]    
Available-for-sale securities $ 160,603 $ 162,882