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Real Estate Securities - Trading Securities by Collateral Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Trading securities	$ 114,211	$ 111,606
Senior Securities
Investment Holdings [Line Items]
Trading securities	57,822	101,753
Senior Securities | Prime
Investment Holdings [Line Items]
Trading securities	51,308	93,802
Senior Securities | Non-prime
Investment Holdings [Line Items]
Trading securities	6,514	7,951
Subordinate Securities | Prime
Investment Holdings [Line Items]
Trading securities	56,389	9,853
Subordinate Securities | Prime mezzanine
Investment Holdings [Line Items]
Trading securities	38,750	0
Subordinate Securities | Prime subordinate
Investment Holdings [Line Items]
Trading securities	$ 17,639	$ 9,853

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.4)



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Trading Securities



-URI http://asc.fasb.org/extlink&oid=6526789

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