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Real Estate Securities - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014 Investment	Sep. 30, 2014 Investment	Sep. 30, 2013	Dec. 31, 2013 Investment
Investment Holdings [Line Items]
Trading securities	$ 108,750,000	$ 108,750,000		$ 124,555,000
Number of AFS securities	294	294		303
Number of securities in unrealized loss position	30	30		76
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer	12	12		5
Gross unrealized losses on AFS securities	3,000,000	3,000,000
Income Statement, other-than-temporary impairments	188,000	565,000	1,666,000
Accumulated other comprehensive income, other-than-temporary impairments	0	4,209,000
Maximum
Investment Holdings [Line Items]
Other than temporary impairment loss on AFS securities	1,000,000
Income Statement, other-than-temporary impairments	1,000,000
Senior Securities
Investment Holdings [Line Items]
Trading securities	108,370,000	108,370,000		119,575,000
Interest Only Securities
Investment Holdings [Line Items]
Trading securities	105,000,000	105,000,000
Residential Senior and Subordinate Securities
Investment Holdings [Line Items]
Trading securities	3,000,000	3,000,000
Residential Subordinate Securities | Maximum
Investment Holdings [Line Items]
Trading securities	1,000,000	1,000,000
Prime | Senior Securities
Investment Holdings [Line Items]
Trading securities	100,612,000	100,612,000		110,505,000
Securities financed through non-recourse resecuritization entity	111,000,000	111,000,000		131,000,000
Non-prime | Senior Securities
Investment Holdings [Line Items]
Trading securities	7,758,000	7,758,000		9,070,000
Securities financed through non-recourse resecuritization entity	122,000,000	122,000,000		132,000,000
Residential
Investment Holdings [Line Items]
Marketable securities, due from five to ten years	2,000,000	2,000,000
Marketable securities, less than five years	9,000,000	9,000,000
Trading Securities | Residential Senior and Subordinate Securities
Investment Holdings [Line Items]
Unpaid principal balance	3,000,000	3,000,000
Trading Securities | Residential Subordinate Securities
Investment Holdings [Line Items]
Unpaid principal balance	$ 11,000,000	$ 11,000,000

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Number of Securities, Continuous Unrealized Loss Position More Than Twelve Months

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Securities Financed Through Nonrecourse Resecuritization

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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For investments which are quantified by principal amount, the principle balance held at close of period.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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