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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Receivables from and Payables to Brokers, Dealers, and Clearing Agencies [Abstract] |  |  |
Interest On Margin Payable | $ 627 | $ 1,456 | $ 2,513

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- Definition Interest On Margin Payable + References No definition available. + Details
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Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration