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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Loss Contingencies [Line Items]
Guarantee liability					$ 1,084
Principal transactions and other income	(2,623)	289	(7,413)	(4,656)
Potential liability, assuming the restricted stock or restricted units to vest	105		105
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Guarantee liability	1,084		1,084
Principal transactions and other income	$ 1,084		$ 1,084

X

- Definition

Potential liability assuming the restricted stock or restricted units to vest .

+ References

No definition available.

+ Details

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X

- Definition

Principal transactions include all gains, losses, and income (interest and dividend) from securities or loans classified as other investments, at fair value (including gains and losses on derivatives classified as other investments, at fair value) in the consolidated balance sheets. Other income includes foreign currency gains and losses, interest earned on cash and cash equivalents, and other miscellaneous income.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifmi_
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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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X

- Details

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