Market Valuation Adjustments, Net (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	$ (11,147)	$ (7,125)	$ (16,887)	$ (18,362)
Real Estate Loans Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	1,323	2,978	1,542	7,344
Real Estate Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	8	296	11	176
Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	(9,594)	6,330	10,322	18,479
REO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	(244)	(1,285)	(1,162)	(1,359)
Impairments on AFS Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	(1,466)	(4,216)	(4,088)	(6,162)
Acacia | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	17,380	11,257	(6,757)	6,004
Derivative Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Market Valuation Adjustments, Net	$ (18,554)	$ (22,485)	$ (16,755)	$ (42,844)