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Real Estate Securities - Available for Sale Securities by Collateral Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Available-for-sale securities	$ 698,356	$ 829,245
Senior Securities
Investment Holdings [Line Items]
Available-for-sale securities	140,616	279,251
Senior Securities | Prime
Investment Holdings [Line Items]
Available-for-sale securities	111,523	210,993
Senior Securities | Non-prime
Investment Holdings [Line Items]
Available-for-sale securities	29,093	68,258
Re-REMIC
Investment Holdings [Line Items]
Available-for-sale securities	162,970	165,064
Subordinate Securities
Investment Holdings [Line Items]
Available-for-sale securities	394,770	384,930
Subordinate Securities | Non-prime
Investment Holdings [Line Items]
Available-for-sale securities	1,000	1,000
Subordinate Securities | Prime mezzanine
Investment Holdings [Line Items]
Available-for-sale securities	225,787	224,624
Subordinate Securities | Prime subordinate
Investment Holdings [Line Items]
Available-for-sale securities	$ 168,983	$ 160,306

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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