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Financial Instruments - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	$ (544)	$ (630)	$ (41)	$ (1,033)
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)	(356)	(395)	446	(1,032)
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)	(235)	(334)	(287)	(74)
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)	(36)	18	35	(9)
Other Contracts [Member] | ARS Purchase Commitment [Member] | Principal Transaction Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	83	81	(235)	94
Interest Rate Contracts [Member] | Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)				$ (12)

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- Definition

Gain (loss) on derivatives pre tax recognized in income.

+ References

No definition available.

+ Details

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- Details

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