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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
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