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Principles of Consolidation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Sequoia
Sep. 30, 2012
Acacia
Sep. 30, 2012
Acacia
Trading Securities
Variable Interest Entity [Line Items]              
Deconsolidated residential loans and other assets         $ 307,000,000    
Deconsolidated asset based securities issued and other liabilities         307,000,000    
Realized gain from deconsolidation         7,000,000    
Trading securities sold, liquidation             8,000,000
Extinguished ABS, liquidation           470,000,000  
Other market valuation adjustments $ (3,470,000) $ (13,448,000) $ (9,503,000) $ (30,335,000)   $ 1,000,000