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Financial Instruments and Other Inventory Positions Owned and Financial Instruments and Other Inventory Positions Sold, but Not Yet Purchased - Gross Fair Market Value of Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Derivative [Line Items]  
Fair value of derivative assets, gross $ 596,313 [1]
Fair value of derivative liabilities, gross 574,982 [1]
Financial instruments and other inventory positions owned | Interest rate derivative contract
 
Derivative [Line Items]  
Fair value of derivative assets, gross 593,627 [1]
Financial instruments and other inventory positions owned | Credit default swap index contract
 
Derivative [Line Items]  
Fair value of derivative assets, gross 2,686 [1]
Financial instruments and other inventory positions sold, but not yet purchased | Interest rate derivative contract
 
Derivative [Line Items]  
Fair value of derivative liabilities, gross 571,359 [1]
Financial instruments and other inventory positions sold, but not yet purchased | Credit default swap index contract
 
Derivative [Line Items]  
Fair value of derivative liabilities, gross $ 3,623 [1]
[1] Amounts are disclosed at gross fair value in accordance with the requirements of ASC 815.