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Acquisitions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 13, 2011 | Dec. 31, 2011 Restricted units [Member] | Sep. 30, 2010 Fairfax, LLC [Member] | Dec. 31, 2012 Fairfax, LLC [Member] Broker-dealer license [Member] | Jan. 31, 2012 JVB Holdings [Member] | Jan. 31, 2011 JVB Holdings [Member] | Jan. 13, 2011 JVB Holdings [Member] | Dec. 31, 2012 JVB Holdings [Member] | Dec. 31, 2011 JVB Holdings [Member] | Dec. 31, 2010 JVB Holdings [Member] | Jan. 31, 2012 JVB Holdings [Member] Restricted units [Member] | Jan. 31, 2011 JVB Holdings [Member] Restricted units [Member] | Jan. 13, 2011 JVB Holdings [Member] Restricted units [Member] | Dec. 31, 2012 JVB Holdings [Member] Restricted units [Member] | Jan. 13, 2011 JVB Holdings [Member] Management Employees [Member] | Dec. 31, 2012 PrinceRidge [Member] | Dec. 31, 2011 PrinceRidge [Member] | Dec. 31, 2010 PrinceRidge [Member] | May 31, 2011 PrinceRidge [Member] | Dec. 31, 2012 PrinceRidge [Member] Operating LLC [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 297 |  |  | $ 16,813 |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,409 |
Other assets of acquiree |  |  |  |  |  | 220 | 166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | 14,956 |  | 15,044 |  |  |  |  | 14,956 | 5,646 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units or shares issued |  |  |  |  | 559,020 |  |  | 186,339 | 313,051 | 313,051 |  |  |  | 186,339 | 559,020 | 559,020 | 372,681 |  |  |  |  |  |
Cash consideration for Management employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,482 |  |  |  |  |
Escrow cash receivables |  |  |  | 88 |  |  |  |  |  | 484 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount withheld for payment to Sellers |  |  |  | 384 |  |  |  |  |  | 384 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 95,240 | 100,331 | 125,552 |  |  |  |  |  |  |  | 23,072 | 18,637 |  |  |  |  |  |  | 43,925 | 27,406 |  |  |
Net income (loss) attributable to parent entity | (968) | (9,388) | 7,595 |  |  |  |  |  |  |  | 1,997 | 192 |  |  |  |  |  |  | 386 | 5,003 |  |  |
Proforma revenue |  |  |  |  |  |  |  |  |  |  |  |  | 150,361 |  |  |  |  |  |  | 114,007 | 150,294 |  |
Proforma net income |  |  |  |  |  |  |  |  |  |  |  |  | 7,727 |  |  |  |  |  |  | (10,527) | 5,097 |  |
Business acquisition purchase price allocation goodwill |  |  |  |  |  |  |  |  |  |  |  | 6,983 |  |  |  |  |  |  | 899 | 992 |  |  |
Consideration for PrinceRidge Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000 |
Percentage ownership in subsidiary |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% | 70.00% |  |  | 98.00%
Adjustment reduced goodwill allocated to non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 93 |  |  |  |

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