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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | $ 10,000 | [1],[2] | $ 100,000 | [1],[2]
Derivatives asset, Fair Value | 0 | [1],[2] | 20 | [1],[2]
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 7,862,541 | [1] | 6,062,292 |
Derivative liability, Fair Value | 2,758 | [1] | 2,421 |
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | U.S. Treasury Futures [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 64,000 | [1],[3] | 20,000 | [1],[3]
Derivative liability, Fair Value | 290 | [1],[3] | 66 | [1],[3]
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Federal Funds Futures [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 7,745,000 | [1],[3] | 5,985,000 | [1],[3]
Derivative liability, Fair Value | 210 | [1],[3] | 8 | [1],[3]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Euro Dollars Futures [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 13,000 | [1] |  |
Derivative liability, Fair Value | 5 | [1] |  |
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Auction Rate Securities [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative liability, notional | 40,541 | [1],[4] | 57,292 | [1],[4]
Derivative liability, Fair Value | 2,253 | [1],[4] | 2,347 | [1],[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Interest Rate Cap [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivatives asset, Notional | 10,000 | [1] | 100,000 | [1]
Derivatives asset, Fair Value | $ 0 | [1] | $ 20 | [1]
[1] | See "Fair Value of Derivative Instruments" below for description of derivative financial instruments.
[2] | Included in receivable from brokers and clearing organizations on the condensed consolidated balance sheet.
[3] | Included in payable from brokers and clearing organizations on the condensed consolidated balance sheet.
[4] | Included in other liabilities on the condensed consolidated balance sheet.

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- Definition Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Total monetary amount specified by the derivative asset(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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- Definition Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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