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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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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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