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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	$ 1,420	$ 721	$ 3,150	$ (405)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Commodity Contract [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)	921	(894)	801	(638)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Commodity Contract [Member] | Federal Funds Futures [Member] | Principal Transaction Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	(107)	71	(52)	260
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Commodity Contract [Member] | Euro Dollars Futures [Member] | Principal Transaction Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	71	(28)	72	(28)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Other Contract [Member] | ARS Purchase Commitments [Member] | Principal Transaction Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)	535	1,572	2,329	13
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Interest Rate Contracts [Member] | Interest Rate Cap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)				(12)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)
Interest Rate Contracts [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Recognized in Income on Derivatives (pre-tax) Gain (Loss)
Reclassified from Accumulated Other Comprehensive Income into Income Effective Portion (after-tax) Gain (Loss)

X

- Definition

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

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4D

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959

+ Details

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