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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) |  |  |  |

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- Definition Gain (loss) on derivatives pre tax recognized in income. + References No definition available. + Details
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- 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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