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Permanent Equity (Future Conversion / Redemption of Operating LLC Units) (Details) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Permanent Equity [Line Items]        
Vesting of units   132,450 90,135  
Stock Issued During Period, Shares, New Issues 212,121 186,342 2,935,506  
Institutional Financial Markets, Inc. [Member]        
Permanent Equity [Line Items]        
Vesting of units   132,450 90,135  
IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Common Unit, Outstanding 18,553,430 20,341,309 19,895,748 16,457,628
Membership Units Received Net Of Surrenders     2,749,167  
Unit Issuance And Surrender Agreement [Member] | IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Membership Units Received Net Of Surrenders 212,121 459,219 502,614  
Daniel G. Cohen and Other Unit Holders [Member] | IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Common Unit, Outstanding 5,324,090 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
Institutional Financial Markets, Inc. [Member] | IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Common Unit, Outstanding 13,229,340 15,017,219 14,571,658 11,133,538
Institutional Financial Markets, Inc. [Member] | Unit Issuance And Surrender Agreement [Member] | IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Membership Units Received Net Of Surrenders 212,121 459,219 502,614  
Other Unit Holders [Member] | IFMI, LLC [Member]        
Permanent Equity [Line Items]        
Common Unit, Outstanding 340,533 340,533 340,533 340,533