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Equity-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Jan. 31, 2012 JVB Holdings [Member] | Jan. 31, 2011 JVB Holdings [Member] | Dec. 31, 2012 JVB Holdings [Member] | Dec. 31, 2011 JVB Holdings [Member] | Dec. 31, 2012 PrinceRidge [Member] | Dec. 31, 2011 PrinceRidge [Member] | Dec. 31, 2012 2010 Equity Incentive Plan [Member] | Dec. 31, 2011 2010 Equity Incentive Plan [Member] | Dec. 31, 2010 2010 Equity Incentive Plan [Member] | Dec. 31, 2012 Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] | Dec. 31, 2011 Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] | Dec. 31, 2010 Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] | Dec. 31, 2012 Service Based Stock Unit [Member] | Dec. 31, 2011 Service Based Stock Unit [Member] | Dec. 31, 2010 Service Based Stock Unit [Member] | Dec. 31, 2012 2009 Equity Award Plan [Member] | Dec. 31, 2012 2009 Equity Award Plan [Member] Time Based And Performance Based [Member] | Dec. 31, 2012 2009 Equity Award Plan [Member] Compensation and benefits [Member] | Dec. 31, 2011 2009 Equity Award Plan [Member] Compensation and benefits [Member] | Dec. 31, 2010 2009 Equity Award Plan [Member] Compensation and benefits [Member] | Dec. 31, 2012 2009 Equity Award Plan [Member] Service Based Stock Unit [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] 2010 Equity Incentive Plan [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] Restricted Stock [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] Restricted Stock Units [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] Restricted Stock [Member] | Dec. 31, 2011 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] Restricted Stock [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] Restricted Stock Units [Member] | Dec. 31, 2011 2006 Equity Incentive Plan [Member] Compensation and benefits [Member] 2010 Equity Incentive Plan [Member] Restricted Stock Units [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Service Based Stock Unit [Member] 2010 Equity Incentive Plan [Member] Restricted Stock [Member] | Dec. 31, 2011 2006 Equity Incentive Plan [Member] Service Based Stock Unit [Member] 2010 Equity Incentive Plan [Member] Restricted Stock [Member] | Dec. 31, 2010 2006 Equity Incentive Plan [Member] Service Based Stock Unit [Member] 2010 Equity Incentive Plan [Member] Restricted Stock [Member] | Dec. 31, 2012 2006 Equity Incentive Plan [Member] Service Based Stock Unit [Member] 2010 Equity Incentive Plan [Member] Restricted Stock Units [Member] | Dec. 31, 2011 2006 Equity Incentive Plan [Member] Service Based Stock Unit [Member] 2010 Equity Incentive Plan [Member] Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Three years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized, equity incentive plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,721,160 |  |  |  |  |  | 4,996,500 |  |  |  |  |  |  |  |  |  |  |
Shares remain available to be issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 2,411,621 |  |  |  |  |  |  |  |  |  |  |
Restricted units outstanding vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,595 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value per share | $ 0.00 |  |  |  | $ 4.89 |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  | $ 0.00 | $ 0.00 | $ 5.28 |  |  | $ 1.47 |  | $ 1.47 | $ 4.88 | $ 0.00 | $ 3.07 | $ 1.43 | $ 4.33 | $ 5.85 | $ 1.51 | $ 3.26
Restricted units or shares, vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,088 |  |  | 44,507 |  | 100,000 |  |  |  |  |  |  |  |  |  |
Restricted units, vested with no remaining service condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,507 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of awards vested |  |  |  | $ 326 |  |  |  |  |  |  | $ 947 | $ 570 | $ 580 |  |  |  |  |  | $ 166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  |  | 911 | 879 | (344) | 687 | 1,290 | 5,708 | 1,361 |  |  |  |  |  |  |  |  | (586) | 400 | 1,144 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units or shares issued |  | 186,339 | 559,020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted units outstanding, JVB acquisition |  |  |  | 372,681 | 559,020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued compensation expense attributable to an award |  |  |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  |  |  |  |  |  |  | 360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,258 | 500,000 |  |  |  |  |  |  |  |  |
Cash payment in exchange for forfeiture of restricted stock, value |  |  |  |  |  |  |  |  | 745 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested awards | $ 1,711 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period over which restricted stock expense expected to be recognized | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the outstanding restricted units of the Operating LLC granted in related to the JVB acquisition. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -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 As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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 Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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 The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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