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Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | $ 12,482 | [1] | $ 17,208 | [1]
Realized Gains (Losses) |  |  |  |  | (9) | [1],[2] |  |
Unrealized Gains (Losses) |  |  |  |  | 405 | [1],[2] | (794) | [1],[3]
Purchases, Issuances |  |  |  |  | 358 | [1] | 572 | [1]
Sales, Settlements |  |  |  |  | (442) | [1] | (1,500) | [1]
Transfers In/ Out |  |  |  |  | 11 | [1] | (13) | [1]
Ending Balance | 12,805 | [1] | 15,473 | [1] | 12,805 | [1] | 15,473 | [1]
Other [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | 50 | [4] |  |
Purchases & Issuances |  |  | 1,502 | [4] | (50) | [4] | 1,502 | [4]
Transfers In/ Out |  | [4] |  | [4] |  | [4] |  | [4]
Ending Balance |  |  | 1,502 | [4] |  |  | 1,502 | [4]
Derivative [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 2,334 |  |  |  | 2,347 |  |  |
Unrealized Gains (Losses) | (81) | [3] |  |  | (94) | [3] |  |
Transfers In/ Out |  |  |  |  |  |  |  |
Ending Balance | 2,253 |  |  |  | 2,253 |  |  |
Mortgage Backed Securities, Other [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | 16 | [5] | 14 | [5]
Realized Gains (Losses) |  |  |  |  | (8) | [2],[5] | 1 | [3],[5]
Unrealized Gains (Losses) |  |  |  |  | 5 | [2],[5] | 0 | [3],[5]
Purchases, Issuances |  |  |  |  | 95 | [5] | 995 | [5]
Sales, Settlements |  |  |  |  | (80) | [5] | (244) | [5]
Transfers In/ Out |  |  |  |  | (2) | [5] | 0 | [5]
Ending Balance | 26 | [5] | 766 | [5] | 26 | [5] | 766 | [5]
Beginning Balance |  |  | 11 | [5] |  |  |  |
Realized Gains (Losses) |  |  |  |  |  |  | 0 | [3],[5]
Purchases & Issuances |  |  | (11) | [5] |  |  | 11 | [5]
Sales & Settlements |  |  |  |  |  |  | (11) | [5]
Transfers In/ Out |  | [5] |  | [5] |  | [5] |  | [5]
Municipal obligations [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | 3,562 |  | 1,787 |
Realized Gains (Losses) |  |  |  |  | (5) | [2] | (12) | [3]
Unrealized Gains (Losses) |  |  |  |  | (505) | [2] | (334) | [3]
Purchases, Issuances |  |  |  |  | 9,960 |  | 2,982 |
Sales, Settlements |  |  |  |  | (2,340) |  | (294) |
Ending Balance | 10,672 |  | 4,129 |  | 10,672 |  | 4,129 |
Other [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  | 65,001 | [4] | 35,909 | [4]
Unrealized Gains (Losses) |  |  |  |  | (351) | [2],[4] | (393) | [3],[4]
Purchases, Issuances |  |  |  |  | 20,675 | [4] | 38,178 | [4]
Sales, Settlements |  |  |  |  | (18,946) | [4] | (8,475) | [4]
Ending Balance | 66,379 | [4] | 65,219 | [4] | 66,379 | [4] | 65,219 | [4]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 12,760 | [1] | 16,141 | [1] |  |  |  |
Realized Gains (Losses) | (9) | [1],[3] |  |  |  |  |  |
Unrealized Gains (Losses) | (32) | [1],[3] | (793) | [1],[3] |  |  |  |
Purchases, Issuances | 231 | [1] | 126 | [1] |  |  |  |
Sales, Settlements | (145) | [1] |  |  |  |  |  |
Transfers In/ Out |  |  | (1) | [1] |  |  |  |
Ending Balance | 12,805 | [1] | 15,473 | [1] | 12,805 | [1] | 15,473 | [1]
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Other [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 12 | [5] | 105 | [5] |  |  |  |
Realized Gains (Losses) |  |  | 1 | [3],[5] |  |  |  |
Unrealized Gains (Losses) | 3 | [3],[5] | (3) | [3],[5] |  |  |  |
Purchases, Issuances | 11 | [5] | 893 | [5] |  |  |  |
Sales, Settlements |  |  | (230) | [5] |  |  |  |
Transfers In/ Out |  |  | 0 | [5] |  |  |  |
Ending Balance | 26 | [5] | 766 | [5] | 26 | [5] | 766 | [5]
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 10,120 |  | 3,829 |  |  |  |  |
Realized Gains (Losses) |  |  | (12) | [3] |  |  |  |
Unrealized Gains (Losses) | (13) | [3] | (143) | [3] |  |  |  |
Purchases, Issuances | 655 |  | 575 |  |  |  |  |
Sales, Settlements | (90) |  | (119) |  |  |  |  |
Ending Balance | 10,672 |  | 4,129 |  | 10,672 |  | 4,129 |
Fair Value, Measurements, Recurring [Member] | Other [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 64,644 | [4] | 63,098 | [4] |  |  |  |
Unrealized Gains (Losses) | 410 | [3],[4] | 543 | [3],[4] |  |  |  |
Purchases, Issuances | 5,950 | [4] | 4,028 | [4] |  |  |  |
Sales, Settlements | (4,625) | [4] | (2,450) | [4] |  |  |  |
Ending Balance | $ 66,379 | [4] | $ 65,219 | [4] | $ 66,379 | [4] | $ 65,219 | [4]
[1] | Primarily represents general partner ownership interests in hedge funds and private equity funds sponsored by the Company.
[2] | Included in principal transactions on the consolidated statement of operations, except for investments which are included in other income on the consolidated statement of operations
[3] | Included in principal transactions on the consolidated statement of operations, except for investments which are included in other income on the condensed consolidated statement of operations.
[4] | Represents auction rate securities that failed in the auction rate market.
[5] | Represents private placements of non-agency collateralized mortgage obligations.

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sales settlements. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities purchases issuances. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis liabilities sales settlements. + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents [net] transfers in to and out of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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