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Collateralized Transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Securities Financing Transaction [Line Items]    
Gross Amounts of Recognized Assets $ 663,565 $ 1,525,881
Gross Amounts Offset, Assets (204,614) (1,160,239)
Net Amounts of Assets Presented on the Balance Sheet 458,951 365,642
Financial Instruments (449,241) (353,341)
Cash Collateral Received      
Net Amount 9,710 12,301
Gross Amounts of Recognized Liabilities 1,173,726 1,743,017
Gross Amounts Offset, Liabilities (204,614) (1,160,239)
Net Amounts of Liabilities Presented on the Balance Sheet 969,112 582,778
Financial Instruments (957,974) (565,524)
Cash Collateral Pledged      
Net Amount 11,138 17,254
Reverse Repurchase Agreements [Member]
    
Securities Financing Transaction [Line Items]    
Gross Amounts of Recognized Assets 389,438 1,160,239
Gross Amounts Offset, Assets (204,614) (1,160,239)
Net Amounts of Assets Presented on the Balance Sheet 184,824  
Financial Instruments (183,305)  
Cash Collateral Received      
Net Amount 1,519  
Securities Borrowed [Member]
    
Securities Financing Transaction [Line Items]    
Gross Amounts of Recognized Assets 274,127 365,642
Gross Amounts Offset, Assets      
Net Amounts of Assets Presented on the Balance Sheet 274,127 365,642
Financial Instruments (265,936) (353,341)
Cash Collateral Received      
Net Amount 8,191 12,301
Repurchase Agreements [Member]
    
Securities Financing Transaction [Line Items]    
Gross Amounts of Recognized Liabilities 962,105 1,552,630
Gross Amounts Offset, Liabilities (204,614) (1,160,239)
Net Amounts of Liabilities Presented on the Balance Sheet 757,491 392,391
Financial Instruments (753,003) (377,737)
Cash Collateral Pledged      
Net Amount 4,488 14,654
Securities Loaned [Member]
    
Securities Financing Transaction [Line Items]    
Gross Amounts of Recognized Liabilities 211,621 190,387
Gross Amounts Offset, Liabilities      
Net Amounts of Liabilities Presented on the Balance Sheet 211,621 190,387
Financial Instruments (204,971) (187,787)
Cash Collateral Pledged      
Net Amount $ 6,650 $ 2,600