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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
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (383) | $ (7,471) | $ 3,552 | $ (5,485)
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) | 20 | (356) | (1,040) | 446
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) | (119) | (235) | (272) | (287)
Commodity Contracts [Member] | general collateral futures [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (4) |  | (2) |
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) | (2) | (36) | (120) | 35
Other Contracts [Member] | Tba Sale Agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 3,461 |  |  |
Other Contracts [Member] | Other [Member] | Tba Sale Agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | (6,518) | (310) |
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) | (4,372) |  | 3,601 |
Other Contracts [Member] | To Be Announced Security [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 156 | (243) | 132 | 12
Other Contracts [Member] | To Be Announced Security [Member] | Other [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  |  | (5,926)
Other Contracts [Member] | Auction Rate Securities Purchase Commitment [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 477 | $ (83) | $ 1,563 | $ 235

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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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