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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.