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Real Estate Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Investment	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Investment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Investment
Investment Holdings [Line Items]
Trading securities	$ 114,211,000		$ 114,211,000		$ 111,606,000
Trading securities acquired	9,000,000		103,000,000
Trading securities sold	2,000,000		81,000,000
Adjustment to valuation of trading securities	(9,000,000)	$ (2,000,000)	(16,000,000)	$ (15,000,000)
Securities pledged as collateral					$ 762,000,000
Available-for-sale securities purchased	0	41,000,000	15,000,000	192,000,000
Available-for-sale securities sold	35,000,000	395,000,000	237,000,000	396,000,000
Available-for-sale securities sold, net realized gains		8,000,000		9,000,000
Gross realized gains	4,053,000	$ 10,227,000	14,315,000	$ 11,219,000
Marketable securities, less than five years (less than)	$ 1,000,000		$ 1,000,000
Number of AFS securities | Investment	247		247		290
Number of securities in unrealized loss position | Investment	30		30		31
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment	15		15		10
OTTI losses on AFS securities			$ 0
Senior Securities
Investment Holdings [Line Items]
Trading securities	$ 57,822,000		57,822,000		$ 101,753,000
Interest Only Securities
Investment Holdings [Line Items]
Trading securities	36,000,000		36,000,000
Residential Senior Securities
Investment Holdings [Line Items]
Trading securities	22,000,000		22,000,000
Residential Subordinate Securities
Investment Holdings [Line Items]
Trading securities	56,000,000		56,000,000
Trading Securities | Residential Senior Securities
Investment Holdings [Line Items]
Unpaid principal balance	22,000,000		22,000,000
Trading Securities | Residential Subordinate Securities
Investment Holdings [Line Items]
Unpaid principal balance	70,000,000		70,000,000
Prime | Senior Securities
Investment Holdings [Line Items]
Trading securities	51,308,000		51,308,000		93,802,000
Securities financed through non-recourse resecuritization entity	81,000,000		81,000,000		105,000,000
Non-prime | Senior Securities
Investment Holdings [Line Items]
Trading securities	6,514,000		6,514,000		7,951,000
Securities financed through non-recourse resecuritization entity	100,000,000		100,000,000		$ 117,000,000
Residential
Investment Holdings [Line Items]
Securities pledged as collateral	587,000,000		587,000,000
Marketable securities, due from five to ten years	$ 2,000,000		$ 2,000,000

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