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Real Estate Securities - Available for Sale Securities by Collateral Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Available-for-sale securities	$ 1,041,458	$ 1,267,624
Senior Securities
Investment Holdings [Line Items]
Available-for-sale securities	445,336	487,557
Senior Securities | Prime
Investment Holdings [Line Items]
Available-for-sale securities	278,960	307,813
Senior Securities | Non-prime
Investment Holdings [Line Items]
Available-for-sale securities	166,376	179,744
Re-REMIC
Investment Holdings [Line Items]
Available-for-sale securities	169,084	168,347
Subordinate Securities
Investment Holdings [Line Items]
Available-for-sale securities	427,038	611,720
Subordinate Securities | Prime
Investment Holdings [Line Items]
Available-for-sale securities	257,263	448,838
Subordinate Securities | Non-prime
Investment Holdings [Line Items]
Available-for-sale securities	1,000	1,000
Subordinate Securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale securities	$ 169,775	$ 162,882

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 5



-Subparagraph (aa)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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