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Fair Values of Real Estate Securities by Collateral Type and Entity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Trading	$ 111,606us-gaap_TradingSecurities	$ 124,555us-gaap_TradingSecurities
Available-for-sale	1,267,624us-gaap_AvailableForSaleSecurities	1,558,306us-gaap_AvailableForSaleSecurities
Total Real Estate Securities	$ 1,379,230us-gaap_MarketableSecurities	$ 1,682,861us-gaap_MarketableSecurities	$ 1,108,753us-gaap_MarketableSecurities

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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