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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
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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 |  |  |

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