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Permanent Equity (Operating LLC Membership Units) (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Permanent Equity [Line Items] |  |  |
Repurchase and retirement of common stock | (2,000,000) | (200,000) |
Forfeiture / cancellation of restricted stock | (32,258) | (32,258) | (104,983)
IFMI, LLC [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Balance, Shares | 20,341,309 | 19,895,748 | 16,457,628
Membership Units Received Net Of Surrenders |  |  | 2,749,167
Vesting of Units |  | 186,342 | 186,339
Repurchase and retirement of common stock | (2,000,000) | (200,000) |
Balance, Shares | 18,553,430 | 20,341,309 | 19,895,748
IFMI, LLC [Member] | Institutional Financial Markets, Inc. [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Balance, Shares | 15,017,219 | 14,571,658 | 11,133,538
Redemption of Operating LLC Units for IFMI Shares |  | 186,342 | 186,339
Repurchase and retirement of common stock | (2,000,000) | (200,000) |
Balance, Shares | 13,229,340 | 15,017,219 | 14,571,658
IFMI, LLC [Member] | Daniel G. Cohen [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Balance, Shares | 4,983,557 | 4,983,557 | 4,983,557
Balance, Shares | 4,983,557 | 4,983,557 | 4,983,557
IFMI, LLC [Member] | Other Unit Holders [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Balance, Shares | 340,533 | 340,533 | 340,533
Vesting of Units |  | 186,342 | 186,339
Redemption of Operating LLC Units for IFMI Shares |  | (186,342) | (186,339)
Balance, Shares | 340,533 | 340,533 | 340,533
IFMI, LLC [Member] | Unit Issuance And Surrender Agreement [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Membership Units Received Net Of Surrenders | 212,121 | 459,219 | 502,614
IFMI, LLC [Member] | Unit Issuance And Surrender Agreement [Member] | Institutional Financial Markets, Inc. [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Membership Units Received Net Of Surrenders | 212,121 | 459,219 | 502,614
IFMI, LLC [Member] | Mead Park and EBC [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Membership Units Received Net Of Surrenders |  |  | 2,749,167
IFMI, LLC [Member] | Mead Park and EBC [Member] | Institutional Financial Markets, Inc. [Member] |  |  |
Permanent Equity [Line Items] |  |  |
Membership Units Received Net Of Surrenders |  |  | 2,749,167

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