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Receivables from and Payables to Brokers, Dealers, and Clearing Agencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Broker Dealer Receivables And Payable [Line Items] |  |  |
Interest on margin payable | $ 1,456 | $ 2,513 | $ 828

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- Details
Name: | ifmi_BrokerDealerReceivablesAndPayableLineItems
Namespace Prefix: | ifmi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest on margin payable. + References No definition available. + Details
Name: | ifmi_InterestOnMarginPayable
Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration