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Real Estate Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Investment	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Investment
Investment Holdings [Line Items]
Trading securities	$ 221,571,000		$ 404,011,000
Trading securities acquired	50,000,000	$ 23,000,000
Trading securities sold	218,000,000	3,000,000
Adjustment to valuation of trading securities	(4,000,000)	(14,000,000)
Available-for-sale securities purchased	16,000,000	10,000,000
Available-for-sale securities sold	126,000,000	91,000,000
Net realized gains	$ 9,246,000	$ 4,306,000
Number of AFS securities | Investment	199		224
Number of securities in unrealized loss position | Investment	28		32
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment	13		15
OTTI losses on AFS securities	$ 0
Trading Securities Pledged as Collateral	142,000,000
Senior Securities
Investment Holdings [Line Items]
Trading securities	27,591,000		$ 254,351,000
Interest Only Securities
Investment Holdings [Line Items]
Trading securities	28,000,000		37,000,000
Subordinate Securities
Investment Holdings [Line Items]
Trading securities	193,980,000		149,660,000
Trading Securities | Residential Senior Securities
Investment Holdings [Line Items]
Unpaid principal balance	0		217,000,000
Trading Securities | Residential Subordinate Securities
Investment Holdings [Line Items]
Unpaid principal balance	212,000,000		168,000,000
Non-prime | Senior Securities
Investment Holdings [Line Items]
Trading securities	5,414,000		5,781,000
Non-prime | Subordinate Securities
Investment Holdings [Line Items]
Trading securities	1,000,000		1,000,000
Residential
Investment Holdings [Line Items]
Securities pledged as collateral	531,000,000		$ 827,000,000
Marketable securities, less than five years (less than)	2,000,000
Marketable securities, due from five to ten years	0
Residential | Available-for-sale Securities
Investment Holdings [Line Items]
Securities pledged as collateral	$ 389,000,000

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