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Organization and Nature of Operations - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Company had assets under management	$ 6.3
Collateralized debt obligations, amount	$ 6.1
Collateralized debt obligations, percentage	95.70%

X

- Definition

Assets under management which are collateralized debt obligations amount.

+ References

No definition available.

+ Details

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X

- Definition

Assets under management which are collateralized debt obligations percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifmi_
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X

- Definition

The carrying amount of assets an investment adviser manages on behalf of investors.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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