v2.4.0.6
Summary of Impact of Derivative Financial Instruments to Condensed Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative Financial Instruments [Line Items]        
Realized Gains (Losses) $ (1,610) $ (2,073) $ 251 $ (1,849)
Net Change in Unrealized Gain (Loss) (13,409) 7,602 6,913 6,154
Freestanding Derivatives | Interest Rate Contracts
       
Derivative Financial Instruments [Line Items]        
Realized Gains (Losses) (2,687) (1,538) (2,551) (536)
Net Change in Unrealized Gain (Loss) 1,022 3,087 7,619 1,907
Freestanding Derivatives | Foreign Currency Contracts
       
Derivative Financial Instruments [Line Items]        
Realized Gains (Losses) 1,070 (591) 2,795 (1,291)
Net Change in Unrealized Gain (Loss) (14,386) 4,536 (665) 4,266
Freestanding Derivatives | Other Credit Derivatives
       
Derivative Financial Instruments [Line Items]        
Realized Gains (Losses) 7 56 7 (22)
Net Change in Unrealized Gain (Loss)   (21)   (19)
Freestanding Derivatives | Credit Default Swaps
       
Derivative Financial Instruments [Line Items]        
Net Change in Unrealized Gain (Loss) (45)   (41)  
Fair Value Hedges - Interest Rate Swaps
       
Derivative Financial Instruments [Line Items]        
Hedge Ineffectiveness 1,342 1,164 548 597
Excluded from Assessment of Effectiveness 4,950 7,049 (938) (374)
Realized Gains (Losses) $ 22,941   $ 22,941