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Real Estate Securities - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) Investment | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) Investment
Investment Holdings [Line Items] |  |  |
Trading securities | $ 221,571,000 |  | $ 404,011,000
Trading securities acquired | 50,000,000 | $ 23,000,000 |
Trading securities sold | 218,000,000 | 3,000,000 |
Adjustment to valuation of trading securities | (4,000,000) | (14,000,000) |
Available-for-sale securities purchased | 16,000,000 | 10,000,000 |
Available-for-sale securities sold | 126,000,000 | 91,000,000 |
Net realized gains | $ 9,246,000 | $ 4,306,000 |
Number of AFS securities | Investment | 199 |  | 224
Number of securities in unrealized loss position | Investment | 28 |  | 32
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment | 13 |  | 15
OTTI losses on AFS securities | $ 0 |  |
Trading Securities Pledged as Collateral | 142,000,000 |  |
Senior Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 27,591,000 |  | $ 254,351,000
Interest Only Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 28,000,000 |  | 37,000,000
Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 193,980,000 |  | 149,660,000
Trading Securities | Residential Senior Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 0 |  | 217,000,000
Trading Securities | Residential Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 212,000,000 |  | 168,000,000
Non-prime | Senior Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 5,414,000 |  | 5,781,000
Non-prime | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 1,000,000 |  | 1,000,000
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Securities pledged as collateral | 531,000,000 |  | $ 827,000,000
Marketable securities, less than five years (less than) | 2,000,000 |  |
Marketable securities, due from five to ten years | 0 |  |
Residential | Available-for-sale Securities |  |  |
Investment Holdings [Line Items] |  |  |
Securities pledged as collateral | $ 389,000,000 |  |

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