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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
	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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-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.



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