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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
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ (5,475) | $ 4,756
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) | (424) | (119)
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) | (160) | 55
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) | (89) |
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (4,325) | 2,928
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) | (86) |
Other Contracts [Member] | TBAs [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (786) | 98
Other Contracts [Member] | Auction Rate Securities Commitments to Purchase [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 395 | $ 1,794

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- Definition Gain (loss) on derivatives pre tax recognized in income. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration