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Permanent Equity and Restrictions - Additional Information (Detail) (USD $)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2013
Sep. 30, 2012
Jan. 31, 2012
Aug. 31, 2011
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 28, 2012
Dec. 21, 2009
Dec. 31, 2011
UIS Agreement [Member]
Jan. 31, 2012
JVB Holdings [Member]
Jan. 31, 2011
JVB Holdings [Member]
Jan. 13, 2011
JVB Holdings [Member]
Dec. 31, 2011
JVB Holdings [Member]
Dec. 31, 2012
Cohen Brothers Financial, LLC [Member]
Dec. 31, 2011
Cohen Brothers Financial, LLC [Member]
Dec. 31, 2012
Other Noncontrolling Interests [Member]
Dec. 31, 2011
Other Noncontrolling Interests [Member]
Dec. 31, 2012
PrinceRidge [Member]
Dec. 31, 2012
2009 Equity Award Plan [Member]
Dec. 31, 2011
Restricted units [Member]
Jan. 31, 2012
Restricted units [Member]
JVB Holdings [Member]
Jan. 31, 2011
Restricted units [Member]
JVB Holdings [Member]
Jan. 13, 2011
Restricted units [Member]
JVB Holdings [Member]
Dec. 31, 2012
Restricted units [Member]
JVB Holdings [Member]
Dec. 31, 2012
Series B Voting Non-Convertible Preferred Stock [Member]
Dec. 31, 2011
Series B Voting Non-Convertible Preferred Stock [Member]
Oct. 18, 2010
Series B Voting Non-Convertible Preferred Stock [Member]
Dec. 31, 2012
Series D Voting Non-Convertible Preferred Stock [Member]
Dec. 28, 2012
Series D Voting Non-Convertible Preferred Stock [Member]
Dec. 31, 2011
Series D Voting Non-Convertible Preferred Stock [Member]
Dec. 31, 2012
Series C Junior Participating Preferred Stock [Member]
Dec. 31, 2011
Series C Junior Participating Preferred Stock [Member]
Dec. 31, 2009
Series C Junior Participating Preferred Stock [Member]
Dec. 31, 2012
Series A Voting Convertible Preferred Stock [Member]
Dec. 31, 2011
Series A Voting Convertible Preferred Stock [Member]
Dec. 31, 2012
Retained Earnings / (Accumulated Deficit) [Member]
Dec. 31, 2012
Treasury Stock [Member]
Dec. 31, 2011
Treasury Stock [Member]
Dec. 31, 2012
Additional Units Acquired (Net of Surrenders) [Member]
Dec. 31, 2011
Additional Units Acquired (Net of Surrenders) [Member]
Dec. 31, 2012
Additional Paid-In Capital [Member]
Dec. 31, 2011
Additional Paid-In Capital [Member]
Dec. 31, 2012
Accumulated Other Comprehensive Income / (Loss) [Member]
Dec. 31, 2011
Accumulated Other Comprehensive Income / (Loss) [Member]
Dec. 31, 2012
Non-controlling Interest [Member]
Dec. 31, 2011
Non-controlling Interest [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Stockholders Equity Note [Line Items]                                                                                                              
Preferred Stock, shares authorized         50,000,000   50,000,000   50,000,000 50,000,000                                         4,983,557 4,983,557 4,983,557 4,983,557     10,000 10,000   1 1                            
Preferred Stock, shares issued                                                             0 4,983,557   4,983,557 4,983,557   0 0   0 0                            
Preferred Stock, shares outstanding                                                             0 4,983,557   4,983,557     0 0   0 0                            
Preferred Stock, voting rights                                                             share of Series B Preferred Stock was entitled to one vote                                                
Preferred Stock Exchange Agreement                         CBF exchanged with the Company 4,983,557 shares of Series B Preferred Stock, representing all of the issued and outstanding Series B Preferred Stock, for 4,983,557 newly issued shares of Series D Voting Non-Convertible Preferred Stock of the Company ("Series D Preferred Stock").                                                                                    
Preferred Stock, shares canceled                                                             4,983,557                                                
Preferred Stock, liquidation value                                                                   $ 0     $ 100,000                                    
Voting Power In Outstanding Stock Percentage                                                                   29.50%                                          
Preferred Stock, redemption date                                                                   Dec. 31, 2013                                          
Number of preferred stock can be purchase for each common stock                           1                                                                                  
Common Stock, par value         $ 0.001   $ 0.001   $ 0.001 $ 0.001       $ 0.001                                                                                  
Preferred Stock, par value         $ 0.001   $ 0.001   $ 0.001 $ 0.001                                         $ 0.001 $ 0.001   $ 0.001   $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001                            
Purchase price per unit                       $ 100.00                                                                                      
Rights exercisable                 0 0 0                                                                                        
Rights agreement expired                 Dec. 31, 2012                                                                                            
Purchase of Common Stock for Treasury       647,701 19,900   667,601     667,601                                                                   667,601                       
Total cost related to common stock repurchased                   1,488,000                                                                                          
Weighted average price per share of common stock repurchased                   $ 2.23                                                                                          
Retirement of treasury shares, dollar value                                                                                   328,000 (328,000) (1,488,000)       1,487,000           1,000  
Retirement of Treasury Stock   50,400         667,601 50,400                                                                      50,400 667,601                 (50,400) (667,601)  
Dividends                 953,000 2,115,000 1,043,000                                                                                        
Cash distributions                 420,000 1,054,000 528,000                                                                                        
Equity interests                                               98.00%                                                              
Operating LLC membership units held by non controlling interest         5,252,002   5,252,002   5,324,090 5,252,002                   4,983,557 4,983,557 340,533 268,445                                                                
Operating LLC membership units is redeemable terms                                       Redeemable at any time on or after January 1, 2014, for (i) cash in an amount equal to the average of the per share closing prices of the Company's Common Stock for the ten consecutive trading days immediately preceding the date the Company receives Mr. Cohen's redemption notice, or (ii) at the Company's option, one share of the Company's Common Stock subject, in each case, to appropriate adjustment upon the occurrence of an issuance of additional shares of the Company's Common Stock as a dividend or other distribution on the Company's outstanding Common Stock, or a further subdivision or combination of the outstanding shares of the Company's Common Stock.                                                                      
Number of units or shares issued                               186,339 313,051 313,051               559,020 186,339 559,020 559,020 372,681                                                  
Vesting of shares 186,339   186,339                          186,339                                                                          643,830 140,857 89,572
One member of the Operating LLC redeemed membership units           31,554                                                                                                  
One member of the Operating LLC redeemed membership units, value           107,000                                                                                                  
Operating LLC restricted units vested                                                 116,595                                                            
Operating LLC membership units elected to redeem for common stock                 44,507                                                                                            
Issued Common Stock                                                 44,507                                                            
Operating LLC membership units elected to remain a partner                 72,088                                                                                            
Ratio of Common Stock to membership units                 1                                                                                            
Units issued by operating LLC to IFMI                 705,083           259,212       313,051                                                   885,529                    
Parent company surrender of Operating LLC units, net of acquisitions                 50,400                                                                         95,338               667,601  
Acquisition / (surrender) of additional units of consolidated subsidiary, net                 $ 928,000 $ (8,000)                                                                         $ 928,000 $ (8,000) $ (23,000) $ (4,000) $ (905,000) $ 12,000