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Permanent Equity and Restrictions - Schedule of Effects of Changes in Ownership Interest in the Operating LLC on Equity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |
Net income / (loss) attributable to IFMI | $ (968) | $ (9,388) | $ 7,595
Increase / (decrease) in IFMI's paid in capital for the acquisition / (surrender) of additional units of consolidated subsidiary, net | 928 | (8) |
Changes from net income/(loss) attributable to IFMI and transfers (to) from non-controlling interest | $ (40) | $ (9,396) | $ 7,595

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