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Real Estate Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) Investment | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Investment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Investment
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | $ 273,531 |  | $ 273,531 |  | $ 404,011
Trading securities acquired | 83,000 | $ 52,000 | 133,000 | $ 75,000 |
Trading securities sold | 18,000 | 16,000 | 236,000 | 19,000 |
Increase (decrease) in valuation of trading securities | (400) | (7,000) | (4,000) | (7,000) |
Trading securities pledged as collateral | 125,000 |  | 125,000 |  |
Available-for-sale securities purchased | 2,000 | 5,000 | 18,000 | 15,000 |
Available-for-sale securities sold | 89,000 | 112,000 | 215,000 | 202,000 |
Net realized gains on AFS securities | $ 9,000 | 6,000 | $ 18,000 | 10,000 |
Number of AFS securities | Investment | 183 |  | 183 |  | 224
Number of securities in unrealized loss position | Investment | 17 |  | 17 |  | 32
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment | 10 |  | 10 |  | 15
Investment fair value changes, net | $ (11,066) | $ (1,788) | $ (30,604) | $ (2,936) |
Other than temporary impairment recognized in AOCI | 2,000 |  | 2,000 |  |
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other than temporary impairment | 3,000 |  | 3,000 |  |
Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 23,132 |  | 23,132 |  | $ 254,351
Interest Only Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 23,000 |  | 23,000 |  | 37,000
Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 250,399 |  | 250,399 |  | 149,660
CRT securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 96,000 |  | 96,000 |  | 48,000
Commercial mortgage backed securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 48,000 |  | 48,000 |  | 8,000
Trading securities | Residential Senior Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 0 |  | 0 |  | 217,000
Trading securities | Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 273,000 |  | 273,000 |  | $ 168,000
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Marketable securities, less than five years (less than) | 1,000 |  | 1,000 |  |
Marketable securities, due from five to ten years | 600 |  | 600 |  |
Residential | Available-for-sale Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | $ 321,000 |  | $ 321,000 |  |

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