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Supplemental Cash Flow Disclosure (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Warrants Not Settleable in Cash [Member] | Oct. 31, 2011 7.625% Contingent Convertible Senior Notes Due 2027 [Member] | Dec. 31, 2011 7.625% Contingent Convertible Senior Notes Due 2027 [Member] | Oct. 31, 2011 10.50% Contingent convertible senior notes due 2027 [Member] | Dec. 31, 2011 10.50% Contingent convertible senior notes due 2027 [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Dec. 31, 2013 Total Stockholders' Equity [Member] | Dec. 31, 2012 Total Stockholders' Equity [Member] | Dec. 31, 2011 Total Stockholders' Equity [Member] | Dec. 31, 2013 Additional paid-in capital [Member] | Dec. 31, 2012 Additional paid-in capital [Member] | Dec. 31, 2011 Additional paid-in capital [Member] | Dec. 31, 2013 Accumulated Other Comprehensive Income (Loss) [Member] | Dec. 31, 2012 Accumulated Other Comprehensive Income (Loss) [Member] | Dec. 31, 2011 Accumulated Other Comprehensive Income (Loss) [Member] | Dec. 31, 2013 Non-controlling Interest [Member] | Dec. 31, 2012 Non-controlling Interest [Member] | Dec. 31, 2011 Non-controlling Interest [Member] | Dec. 31, 2012 Retained Earnings/ (Accumulated Deficit) [Member] | Dec. 31, 2012 Treasury Stock [Member] | Dec. 31, 2011 Treasury Stock [Member] | Dec. 31, 2012 IFMI, LLC [Member] | Dec. 31, 2011 IFMI, LLC [Member] | Dec. 31, 2013 IFMI, LLC [Member] | Dec. 31, 2013 Star Asia Manager [Member] | Dec. 31, 2011 Star Asia [Member] | Dec. 31, 2013 Star Asia Manager [Member] | Jan. 13, 2011 JVB Holdings [Member] | Dec. 31, 2011 JVB Holdings [Member] | Dec. 31, 2010 JVB Holdings [Member] | Dec. 31, 2011 PrinceRidge [Member] | May 31, 2011 PrinceRidge [Member]
Debt Conversion [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid | $ 3,170,000 |  | $ 4,698,000 |  | $ 5,690,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes paid | 351,000 |  | 158,000 |  | 66,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax refunds | 96,000 |  | 134,000 |  | 397,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition / (surrender) of additional units of consolidated subsidiary, net | 2,764,000 |  | 928,000 |  | (8,000) |  |  |  |  |  |  |  | 2,637,000 | 905,000 | (12,000) | 2,764,000 | 928,000 | (8,000) | (127,000) | (23,000) | (4,000) | (2,637,000) | (905,000) | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of equity method investee | 705,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 705,000 | [1],[2] |  |  |  |  |  |  |  |
Reclassification to Mandatorily Redeemable Equity Interests |  |  | 6,446,000 |  | 3,536,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  | 4,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer from Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 476,000 |  |  |  |  |  |  |
Transfer from Investments, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,452 |  |  |  |  |  |  |
Other Significant Noncash Transaction, Value of Consideration Given |  |  |  |  | 146,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Significant Noncash Transaction, Shares |  |  |  |  | 3,750 | 371,950 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Retired |  |  | 50,400 |  | 667,601 |  |  |  |  |  | 50,400 | 667,601 |  |  |  |  |  |  |  |  |  |  |  |  |  | (50,400) | (667,601) | 50,400 | 667,601 |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Retired, Cost Method, Amount |  |  |  |  | 1,488,000 |  |  |  |  |  |  | 1,000 |  |  |  |  |  | 1,487,000 |  |  |  |  |  |  | 328,000 | (328,000) | (1,488,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization Of Equity Method Investee |  |  | 1,841,000 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount |  |  |  |  |  |  | 500,000 | 7,621,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Interest Rate of Debt |  |  |  |  |  |  |  | 7.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  | 500,000 | 7,621,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Rate |  |  |  |  |  |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Fair Value of IFMI Contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,855,000 | [4] |  | 16,813,000 | 16,813,000 | 18,409,000 |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 425,000 |  | 15,044,000 | 5,646,000 |  |  |
Cash paid for acquisition of JVB Financial Holdings, L.L.C., net of cash acquired |  |  |  |  | (14,956,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,956,000) |  |  |
Contribution For Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,531,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 313,051 |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 725,000 |  |  | 326,000 |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,502,000 |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.60% |  | 73.20% |  |  |  |  |  |  |  |  | 70.50% | 70.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.50% |
[1] | See note 4.
[2] | See note 31.
[3] | On December 20, 2012, Star Asia Opportunity II completed a reorganization whereby its assets were contributed into a subsidiary of the Star Asia Special Situations Fund. The net effect of the reorganization to the Company was that the Company exchanged its ownership interest in Star Asia Opportunity II for cash and an interest in the Star Asia Special Situations Fund. The Star Asia Special Situations Fund is carried at fair value and included as a component of other investments, at fair value. The cash received by the Company in the reorganization is included as distributions / repayments above. The remaining carrying value of the Company’s equity method investment in Star Asia Opportunity II was $1,841 after taking into account the cash distribution from the reorganization. This amount was reclassified from investments in equity method affiliates to other investments, at fair value. It is shown as reorganization in the table above and is treated as the cost basis of the Company’s investment in the Star Asia Special Situations Fund. Any difference between the cost basis assigned and the fair value of the Company’s investment in the Star Asia Special Situations Fund is included as a component of principal transactions, and other income. See notes 8, 9, 28, and 29.
[4] | The purchase price represents the cash paid to Mercury of $425; the note payable to Mercury of $725; and the Company’s equity method investment immediately prior to the Star Asia Manager Repurchase Transaction. For purposes of the provisional amounts, the Company has assumed the carrying value of the Company’s equity method investment immediately prior to the Star Asia Manager Repurchase Transaction approximated fair value. As with all provisional purchase accounting amounts, this is subject to adjustment during the measurement period.

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- Definition The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Value of investments transferred from the entity's investments in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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