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Real Estate Securities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Investment | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Investment | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Investment
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | $ 114,211,000 |  | $ 114,211,000 |  | $ 111,606,000
Trading securities acquired | 9,000,000 |  | 103,000,000 |  |
Trading securities sold | 2,000,000 |  | 81,000,000 |  |
Adjustment to valuation of trading securities | (9,000,000) | $ (2,000,000) | (16,000,000) | $ (15,000,000) |
Securities pledged as collateral |  |  |  |  | $ 762,000,000
Available-for-sale securities purchased | 0 | 41,000,000 | 15,000,000 | 192,000,000 |
Available-for-sale securities sold | 35,000,000 | 395,000,000 | 237,000,000 | 396,000,000 |
Available-for-sale securities sold, net realized gains |  | 8,000,000 |  | 9,000,000 |
Gross realized gains | 4,053,000 | $ 10,227,000 | 14,315,000 | $ 11,219,000 |
Marketable securities, less than five years (less than) | $ 1,000,000 |  | $ 1,000,000 |  |
Number of AFS securities | Investment | 247 |  | 247 |  | 290
Number of securities in unrealized loss position | Investment | 30 |  | 30 |  | 31
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment | 15 |  | 15 |  | 10
OTTI losses on AFS securities |  |  | $ 0 |  |
Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | $ 57,822,000 |  | 57,822,000 |  | $ 101,753,000
Interest Only Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 36,000,000 |  | 36,000,000 |  |
Residential Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 22,000,000 |  | 22,000,000 |  |
Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 56,000,000 |  | 56,000,000 |  |
Trading Securities | Residential Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 22,000,000 |  | 22,000,000 |  |
Trading Securities | Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 70,000,000 |  | 70,000,000 |  |
Prime | Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 51,308,000 |  | 51,308,000 |  | 93,802,000
Securities financed through non-recourse resecuritization entity | 81,000,000 |  | 81,000,000 |  | 105,000,000
Non-prime | Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 6,514,000 |  | 6,514,000 |  | 7,951,000
Securities financed through non-recourse resecuritization entity | 100,000,000 |  | 100,000,000 |  | $ 117,000,000
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | 587,000,000 |  | 587,000,000 |  |
Marketable securities, due from five to ten years | $ 2,000,000 |  | $ 2,000,000 |  |

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