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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, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Gross realized gains | $ 4,306 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Total Realized Gains on Sales and Calls of AFS Securities, Net | 4,306 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 987 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Call Option |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross realized gains | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember | 987 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember
Gross realized losses | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember | $ 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / us-gaap_OptionIndexedToIssuersEquityEquityAxis = us-gaap_CallOptionMember

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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 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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