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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
	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

Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls

+ References

No definition available.

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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

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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

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