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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

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