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Permanent Equity (Future Conversion / Redemption of Operating LLC Units) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Permanent Equity [Line Items] |  |  |  |  |
Vesting of units | 90,135 | [1] |  |  |
Membership Units Received Net Of Surrenders | 2,749,167 |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,935,506 |  | 230,846 | 313,051 |
Institutional Financial Markets, Inc. [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Vesting of units | 90,135 |  |  |  |
IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Common Unit, Outstanding | 19,895,748 |  | 16,457,628 | 15,500,011 | 15,626,903
Vesting of units | 186,339 |  | 302,934 |  |
Stock Redeemed or Called During Period, Shares |  |  |  | 31,554 |
Stock Redeemed or Called During Period, Value |  |  |  | $ 107 |
Unit Issuance And Surrender Agreement [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Membership Units Received Net Of Surrenders | 502,614 |  | 705,083 | 259,212 |
JVB Holdings Agreement [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 186,342 |  | 372,681 | 559,020 |
JVB Holdings Agreement [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 559,020 |
Vesting of units | 186,339 |  | 186,339 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 186,342 |  |  |  |
Membership Units Received Net Of Surrenders |  |  |  | 313,051 |
Private Placement [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Membership Units Received Net Of Surrenders | 2,749,167 |  |  |  |
2009 Equity Award Plan [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |  |
2009 Equity Award Plan [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Vesting of units |  |  | 116,595 |  |
Stock Redeemed or Called During Period, Shares |  |  | 44,507 |  |
Units Not Exchanged [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Vesting of units |  |  | 72,088 |  |
Daniel G. Cohen and Other Unit Holders [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Common Unit, Outstanding | 5,324,090 |  |  |  |
Daniel G. Cohen [Member] | IFMI, LLC [Member] |  |  |  |  |
Permanent Equity [Line Items] |  |  |  |  |
Common Unit, Outstanding | 4,983,557 |  | 4,983,557 | 4,983,557 | 4,983,557
[1] | Vesting includes 90,135 of unvested restricted units of IFMI Common Stock. See note 20.

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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