Permanent Equity (Schedule Of Unrestricted Common Stock Activity) (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Class of Stock [Line Items]
Balance, Shares			11,552,551		12,679,717		10,482,684
Issuance of common stock			2,935,506		230,846		313,051
Issuance as equity-based compensation			408,079		428,984		3,924,612
Vesting of shares			90,135	[1]
Shares withheld for employee taxes			(71,583)		(162,048)		(24,668)
Forfeiture / cancellation of restricted stock			(104,983)		(1,508,353)	[2]	(1,348,361)	[2]
Surrender of restricted stock					(116,595)	[3]
Purchase of common stock for treasury	(19,900)	(647,701)					(667,601)
Retirement of treasury stock					(50,400)		(667,601)
Balance, Shares	12,679,717		14,809,705	[4]	11,552,551		12,679,717
Institutional Financial Markets, Inc. [Member]
Class of Stock [Line Items]
Vesting of shares			90,135
Forfeiture / cancellation of restricted stock							(90,135)
PrinceRidge [Member]
Class of Stock [Line Items]
Forfeiture / cancellation of restricted stock					848,742
Common Stock [Member]
Class of Stock [Line Items]
Balance, Shares			10,794,725		10,132,497		10,370,858
Issuance of common stock			2,935,506		230,846		313,051
Vesting of shares			739,931	[1]	643,830		140,857
Shares withheld for employee taxes			(71,583)		(162,048)		(24,668)
Retirement of treasury stock					(50,400)		(667,601)
Balance, Shares	10,132,497		14,398,579	[4]	10,794,725		10,132,497
Deferred Compensation Share Based Payments [Member]
Class of Stock [Line Items]
Balance, Shares			757,826		2,597,620		162,226
Issuance as equity-based compensation			408,079		428,984		3,924,612
Vesting of shares			(649,796)	[1]	(643,830)		(140,857)
Forfeiture / cancellation of restricted stock			(104,983)		(1,508,353)	[2]	(1,348,361)	[2]
Surrender of restricted stock					(116,595)	[3]
Balance, Shares	2,597,620		411,126	[4]	757,826		2,597,620
Treasury Stock [Member]
Class of Stock [Line Items]
Balance, Shares					(50,400)		(50,400)
Purchase of common stock for treasury							(667,601)
Retirement of treasury stock					50,400		667,601
Balance, Shares	(50,400)						(50,400)

[1] Vesting includes 90,135 of unvested restricted units of IFMI Common Stock. See note 20.

[2] For the 2011 period, the cancellation of restricted stock included the 90,135 shares of restricted stock of IFMI that the Company cancelled and replaced with 90,135 restricted units of IFMI Common Stock in October 2011. The 90,135 restricted units were not included in the above table since the restricted units are not considered legally outstanding.For the 2012 period, the forfeiture of restricted stock included the 848,742 shares of restricted stock that the former chief executive officer of PrinceRidge and member of the Board of Managers of PrinceRidge GP and the former chairman of the Board of Managers of PrinceRidge GP forfeited in connection with the separation, release, and repurchase agreements that the Company entered into with them in July 2012. See note 20.

[3] In December 2012, Mr. Cohen transferred 116,595 restricted shares of IFMI Common Stock to the Company in order to satisfy his obligation under the Equity Funding Agreement. See note 20 for the discussion about the 2009 Restricted Units Pursuant to the 2009 Equity Award Plan.

[4] Excludes remaining restricted units of IFMI Common Stock. See note 20.