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Fair Value Measurements - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 1,473 | $ 1,730
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) | 906 | (972)
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) | (289) | (17)
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) | 5 | (10)
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 2,021 | 3,028
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) | (1,277) |
Other Contracts [Member] | TBAs [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 61 | (15)
Other Contracts [Member] | ARS Purchase Commitments [Member] | Principal Transaction Revenue [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 46 | (300)
Interest Rate Contracts [Member] | Caps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | (12)
Foreign exchange contracts [Member] | Options [Member] | Other [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | $ 28

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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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