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Real Estate Securities - Trading Securities by Collateral Type (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Trading securities | $ 273,531 | $ 404,011
Senior Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 23,132 | 254,351
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 17,710 | 248,570
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 5,422 | 5,781
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 250,399 | 149,660
Subordinate Securities | Prime mezzanine |  |
Investment Holdings [Line Items] |  |
Trading securities | 164,521 | 136,140
Subordinate Securities | Prime subordinate |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 85,878 | $ 13,520

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