v2.4.0.8
Offsetting of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative or Financial Instrument [Line Items]    
Gross and Net Amounts of Assets Presented in the Statement of Financial Condition $ 142,012 $ 303,362
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 98,390 252,001
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received 30,743 36,748
Asset Net Amount 12,879 14,613
Gross And Net Amounts Of Liabilities Presented In the Statement Of Financial Condition 79,110 146,463
Gross Amount of Liabilities Not Offset in the Statement of Financial Condition, Financial Instruments 71,078 146,249
Cash Collateral Pledged 7,976  
Liability Net Amount 56 214
Freestanding Derivatives
    
Derivative or Financial Instrument [Line Items]    
Gross and Net Amounts of Assets Presented in the Statement of Financial Condition 46,035 55,344
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 2,629 3,983
Gross Amounts Not Offset in the Statement of Financial Condition, Cash Collateral Received 30,743 36,748
Asset Net Amount 12,663 14,613
Gross And Net Amounts Of Liabilities Presented In the Statement Of Financial Condition 10,605 4,197
Gross Amount of Liabilities Not Offset in the Statement of Financial Condition, Financial Instruments 2,629 3,983
Cash Collateral Pledged 7,976  
Liability Net Amount   214
Reverse Repurchase Agreements
    
Derivative or Financial Instrument [Line Items]    
Gross and Net Amounts of Assets Presented in the Statement of Financial Condition 95,977 248,018
Gross Amounts Not Offset in the Statement of Financial Condition, Financial Instruments 95,761 248,018
Asset Net Amount 216  
Repurchase Agreements
    
Derivative or Financial Instrument [Line Items]    
Gross And Net Amounts Of Liabilities Presented In the Statement Of Financial Condition 68,505 142,266
Gross Amount of Liabilities Not Offset in the Statement of Financial Condition, Financial Instruments 68,449 142,266
Liability Net Amount $ 56