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Real Estate Securities - Available for Sale Securities by Collateral Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Available-for-sale securities	$ 829,245	$ 1,267,624
Senior Securities
Investment Holdings [Line Items]
Available-for-sale securities	279,251	487,557
Senior Securities | Prime
Investment Holdings [Line Items]
Available-for-sale securities	210,993	307,813
Senior Securities | Non-prime
Investment Holdings [Line Items]
Available-for-sale securities	68,258	179,744
Re-REMIC
Investment Holdings [Line Items]
Available-for-sale securities	165,064	168,347
Subordinate Securities
Investment Holdings [Line Items]
Available-for-sale securities	384,930	611,720
Subordinate Securities | Prime
Investment Holdings [Line Items]
Available-for-sale securities	220,141	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	$ 164,789	$ 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=51813488&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=49167202&loc=d3e26610-111562

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