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Real Estate Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 Investment | Sep. 30, 2014 Investment | Sep. 30, 2013 | Dec. 31, 2013 Investment
Investment Holdings [Line Items] |  |  |  |
Trading securities | $ 108,750,000 | $ 108,750,000 |  | $ 124,555,000
Number of AFS securities | 294 | 294 |  | 303
Number of securities in unrealized loss position | 30 | 30 |  | 76
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | 12 | 12 |  | 5
Gross unrealized losses on AFS securities | 3,000,000 | 3,000,000 |  |
Income Statement, other-than-temporary impairments | 188,000 | 565,000 | 1,666,000 |
Accumulated other comprehensive income, other-than-temporary impairments | 0 | 4,209,000 |  |
Maximum |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Other than temporary impairment loss on AFS securities | 1,000,000 |  |  |
Income Statement, other-than-temporary impairments | 1,000,000 |  |  |
Senior Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 108,370,000 | 108,370,000 |  | 119,575,000
Interest Only Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 105,000,000 | 105,000,000 |  |
Residential Senior and Subordinate Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 3,000,000 | 3,000,000 |  |
Residential Subordinate Securities | Maximum |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 1,000,000 | 1,000,000 |  |
Prime | Senior Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 100,612,000 | 100,612,000 |  | 110,505,000
Securities financed through non-recourse resecuritization entity | 111,000,000 | 111,000,000 |  | 131,000,000
Non-prime | Senior Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Trading securities | 7,758,000 | 7,758,000 |  | 9,070,000
Securities financed through non-recourse resecuritization entity | 122,000,000 | 122,000,000 |  | 132,000,000
Residential |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Marketable securities, due from five to ten years | 2,000,000 | 2,000,000 |  |
Marketable securities, less than five years | 9,000,000 | 9,000,000 |  |
Trading Securities | Residential Senior and Subordinate Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Unpaid principal balance | 3,000,000 | 3,000,000 |  |
Trading Securities | Residential Subordinate Securities |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Unpaid principal balance | $ 11,000,000 | $ 11,000,000 |  |

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