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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Revenues-principal transactions and other income [Member] | Dec. 31, 2011 Revenues-principal transactions and other income [Member] | Dec. 31, 2010 Revenues-principal transactions and other income [Member] | Dec. 31, 2012 Operating LLC [Member] | Dec. 31, 2011 Operating LLC [Member] | Dec. 31, 2012 PrinceRidge [Member] | Dec. 31, 2011 PrinceRidge [Member] | Dec. 31, 2012 Star Asia Manager [Member] | Dec. 31, 2012 Deep Value GP [Member] | Dec. 31, 2011 Deep Value GP [Member] | Dec. 31, 2010 Deep Value GP [Member] | Dec. 31, 2012 Deep Value GP II [Member] | Dec. 31, 2011 Deep Value GP II [Member] | Dec. 31, 2012 Duart Capital outstanding equity interests [Member] | Dec. 31, 2011 Duart Capital outstanding equity interests [Member] | Dec. 31, 2012 SAA Manager [Member] | Dec. 31, 2012 Star Asia Opportunity [Member] | Dec. 31, 2011 Star Asia Opportunity [Member] | Dec. 31, 2012 Star Asia [Member] | Dec. 31, 2011 Star Asia [Member] | Dec. 31, 2012 Star Asia SPV [Member] | Dec. 31, 2011 Star Asia SPV [Member] | Dec. 31, 2012 Star Asia Capital Management [Member] | Dec. 31, 2011 Star Asia Capital Management [Member] | Dec. 31, 2012 Star Asia Special Situations Fund [Member] | Dec. 19, 2012 Star Asia Opportunity II [Member] | Dec. 31, 2012 SAP GP [Member] | Dec. 31, 2012 EuroDekania [Member] | Dec. 31, 2011 EuroDekania [Member] | Jun. 23, 2011 Muni Funding Company of America, LLC [Member] | Jun. 22, 2011 Muni Funding Company of America, LLC [Member] | Dec. 31, 2012 Tiptree [Member] | Dec. 31, 2011 Tiptree [Member] | Jun. 23, 2011 Tiptree [Member] | Dec. 31, 2010 Duart Fund [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Minimum [Member]
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares percentage held |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% | 50.00% | 40.00% | 40.00% | 20.00% | 20.00% | 33.00% | 28.00% | 28.00% | 28.00% | 28.00% | 31.00% | 31.00% | 33.00% | 33.00% | 6.00% | 20.00% | 33.00% | 10.00% | 10.00% |  | 3.00% | 1.00% | 1.00% |  |  |  |
Fund initial life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Fund extended life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Fund closing date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 20, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Cumulative annual internal rate of return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |
Common stock exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,200 |  |  |  | 111,133 |  |  |
Redemption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Furniture and equipment, estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 3 years
Leasehold improvements, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 5 years
Parent company ownership in majority owned subsidiaries |  | 70.00% |  |  |  | 67.60% | 66.10% | 98.00% | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non controlling ownership in consolidated entity |  | 30.00% |  |  |  | 32.40% | 33.90% | 2.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue |  |  | (3.00%) | 2.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Debt in fair value | $ 34.6 | $ 43.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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