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Related Party Transactions - Schedule of Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Net trading	$ 69,486	$ 73,167	$ 70,809
Income /(loss) from equity method affiliates	5,052	6,232	5,884
Related Party Transactions [Member]
Related Party Transaction [Line Items]
Management fee revenue	203	1,392	3,520
Net trading	156	557	272
Principal transactions and other income, Dividend income and other	970	368	90
Principal transactions and other income, Gain/ (Loss)	(6,943)	(357)	23,460
Income /(loss) from equity method affiliates	5,052	6,232	5,884
Shared Services (Paid) / Received		9	7
Related Party Transactions [Member] | CBF [Member]
Related Party Transaction [Line Items]
Management fee revenue	64	273	261
Related Party Transactions [Member] | TBBK [Member]
Related Party Transaction [Line Items]
Net trading	156	658
Related Party Transactions [Member] | Star Asia [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Dividend income and other		38
Principal transactions and other income, Gain/ (Loss)	(7,274)	(542)	18,126
Related Party Transactions [Member] | Star Asia Manager [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	1,101	1,694	834
Related Party Transactions [Member] | Star Asia SPV [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	1,581	702	263
Related Party Transactions [Member] | Star Asia Opportunity [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	544	405
Related Party Transactions [Member] | Star Asia Opportunity II [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	(382)
Related Party Transactions [Member] | Star Asia Capital Management [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	504	44
Related Party Transactions [Member] | Star Asia Special Situations Fund [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Gain/ (Loss)	662
Related Party Transactions [Member] | SAA Manager [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates	(8)
Related Party Transactions [Member] | EuroDekania [Member]
Related Party Transaction [Line Items]
Management fee revenue	139	667	667
Net trading		(101)	138
Principal transactions and other income, Dividend income and other	970	298
Principal transactions and other income, Gain/ (Loss)	(331)	579	525
Related Party Transactions [Member] | Deep Value [Member]
Related Party Transaction [Line Items]
Management fee revenue		452	2,538
Principal transactions and other income, Gain/ (Loss)		(9)	4,481
Income /(loss) from equity method affiliates	1,712	4,351	6,070
Related Party Transactions [Member] | Brigadier [Member]
Related Party Transaction [Line Items]
Management fee revenue			54
Principal transactions and other income, Gain/ (Loss)			64
Related Party Transactions [Member] | RAIT [Member]
Related Party Transaction [Line Items]
Net trading			134
Principal transactions and other income, Gain/ (Loss)			387
Shared Services (Paid) / Received			(10)
Related Party Transactions [Member] | MFCA [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Dividend income and other		32	90
Principal transactions and other income, Gain/ (Loss)		71	100
Shared Services (Paid) / Received		9	17
Related Party Transactions [Member] | Duart Fund [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Gain/ (Loss)		(456)	(223)
Related Party Transactions [Member] | Duart Capital [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates			(1,283)
Related Party Transactions [Member] | Duart Capital and Other [Member]
Related Party Transaction [Line Items]
Income /(loss) from equity method affiliates		$ (964)

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Number 210

-Section 03

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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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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-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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-Number AAG-BRD

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-Chapter 4

-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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The net gain (loss) on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 44C

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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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