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Real Estate Securities - Trading Securities by Collateral Type (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Trading securities | $ 221,571 | $ 404,011
Senior Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 27,591 | 254,351
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 22,177 | 248,570
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 5,414 | 5,781
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 193,980 | 149,660
Subordinate Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 1,000 | 1,000
Subordinate Securities | Prime mezzanine |  |
Investment Holdings [Line Items] |  |
Trading securities | 144,317 | 136,140
Subordinate Securities | Prime subordinate |  |
Investment Holdings [Line Items] |  |
Trading securities | 49,663 | 13,520
Subordinate Securities | CRT securities |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 62,000 | $ 25,000

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- Definition 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 + Details
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