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Fair Value Measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) $ 1,473 $ 1,730
Commodity Contracts [Member] | U.S. Treasury Futures [Member] | Principal Transaction Revenue [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) 906 (972)
Commodity Contracts [Member] | Federal Funds Futures [Member] | Principal Transaction Revenue [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) (289) (17)
Commodity Contracts [Member] | Euro Dollars Futures [Member] | Principal Transaction Revenue [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) 5 (10)
Other Contracts [Member] | Tba Sale Agreements [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) 2,021 3,028
Other Contracts [Member] | Other [Member] | Interest Rate Lock Commitments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) (1,277)  
Other Contracts [Member] | TBAs [Member] | Principal Transaction Revenue [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) 61 (15)
Other Contracts [Member] | ARS Purchase Commitments [Member] | Principal Transaction Revenue [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss) 46 (300)
Interest Rate Contracts [Member] | Caps [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss)   (12)
Foreign exchange contracts [Member] | Options [Member] | Other [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Recognized in Income on Derivatives (pre-tax) Gain (Loss)   $ 28