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Derivative Financial Instruments-Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Financial Instruments Not Designated as Hedging Instruments, Unrealized Gain / (Loss)	$ 22	$ (16)
Investments-trading [Member] | TBAs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Financial Instruments Not Designated as Hedging Instruments, Unrealized Gain / (Loss)	35
Trading securities sold not yet purchased [Member] | TBAs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Financial Instruments Not Designated as Hedging Instruments, Unrealized Gain / (Loss)	$ (13)	$ (16)

X

- Definition

Derivative instrument not designated as hedging instruments gain loss net.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifmi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration