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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | $ 34,922 | $ 15,030 | $ 24,613
Gross realized losses | (608) | (2,713) | (214)
Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls | 36,369 | 13,917 | 24,765
Call Option |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 2,167 | 1,600 | 366
Gross realized losses | $ (112) | $ 0 | $ 0

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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