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Fair Value Disclosures - Schedule of Additional Information about Assets and Liabilities Measured at Fair Value on Recurring Basis Level 3 Inputs (Parenthetical) (Detail) (Star Asia Special Situations Fund [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Star Asia Special Situations Fund [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Purchase of Star Asia Special Situations Fund | $ 1,841

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- Definition Initial investment in other investment (cost basis). + 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