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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional $ 10,000 [1],[2] $ 100,000 [1],[2]
Derivatives asset, Fair Value 0 [1],[2] 20 [1],[2]
Not Designated as Hedging Instrument [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 7,862,541 [1] 6,062,292
Derivative liability, Fair Value 2,758 [1] 2,421
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | U.S. Treasury Futures [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 64,000 [1],[3] 20,000 [1],[3]
Derivative liability, Fair Value 290 [1],[3] 66 [1],[3]
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Federal Funds Futures [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 7,745,000 [1],[3] 5,985,000 [1],[3]
Derivative liability, Fair Value 210 [1],[3] 8 [1],[3]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Euro Dollars Futures [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 13,000 [1]  
Derivative liability, Fair Value 5 [1]  
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Auction Rate Securities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liability, notional 40,541 [1],[4] 57,292 [1],[4]
Derivative liability, Fair Value 2,253 [1],[4] 2,347 [1],[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Interest Rate Cap [Member]
    
Derivatives, Fair Value [Line Items]    
Derivatives asset, Notional 10,000 [1] 100,000 [1]
Derivatives asset, Fair Value $ 0 [1] $ 20 [1]
[1] See "Fair Value of Derivative Instruments" below for description of derivative financial instruments.
[2] Included in receivable from brokers and clearing organizations on the condensed consolidated balance sheet.
[3] Included in payable from brokers and clearing organizations on the condensed consolidated balance sheet.
[4] Included in other liabilities on the condensed consolidated balance sheet.