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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
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | $ 12,629 | $ 2,214 | $ 3,935 | $ 3,998
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) | (637) | 921 | (1,060) | 801
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) | 7 | (107) | (153) | (52)
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) | (27) |  | (116) | 72
Other Contracts [Member] | Tba Sale Agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | 4,596 |  |  |
Other Contracts [Member] | Other [Member] | Tba Sale Agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  | 692 | (3,771) |
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) | 8,059 |  | 7,973 |
Other Contracts [Member] | TBAs [Member] | Principal Transaction Revenue [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) | (60) | 173 | (24) | 256
Other Contracts [Member] | TBAs [Member] | Other [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Recognized in Income on Derivatives (pre-tax) Gain (Loss) |  |  |  | 592
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) | $ 691 | $ 535 | $ 1,086 | $ 2,329

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
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