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Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-Based Compensation Expense	$ 1,271	$ 7,674	$ 2,505
Non Equity Based Compensation and Benefits Expense	61,680	70,553	74,941
Total Compensation and Benefits	$ 62,951	$ 78,227	$ 77,446

X

- Definition

Represents cash compensation and benefits expense incurred during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represent consolidated equity based compensation expense recognized during the period.

+ References

No definition available.

+ Details

Name:	ifmi_ConsolidatedEquityBasedCompensationExpense
Namespace Prefix:	ifmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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Balance Type:	debit
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- Details

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