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Segment And Geographic Information - Financial Information for Company's Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Statistics [Line Items]        
Net trading $ 69,486 $ 73,167 $ 70,809  
Asset management 23,172 21,698 25,281  
New issue and advisory 5,021 3,585 3,778  
Principal transactions and other income (2,439) 1,881 25,684  
Total revenues 95,240 100,331 125,552  
Total operating expenses 94,945 118,496 116,810  
Operating income / (loss) 295 (18,165) 8,742  
Income / (loss) from equity method affiliates 5,052 6,232 5,884  
Other non operating income / (expense) (8,003) (5,943) (4,160)  
Income / (loss) before income tax expense / (benefit) (2,656) (17,876) 10,466  
Income tax expense / (benefit) (615) (1,149) (749)  
Net income / (loss) (2,041) (16,727) 11,215  
Less: Net income / (loss) attributable to the non-controlling interest (1,073) (7,339) 3,620  
Net income / (loss) attributable to IFMI (968) (9,388) 7,595  
Other statement of operations data:        
Depreciation and amortization (included in total operating expense) 1,305 2,238 2,356  
Balance sheet data:        
Total assets 341,001 420,590 306,747  
Investment in equity method affiliates (included in total assets) 1,910 6,076 2,106 477
Capital Markets [Member]
        
Operating Statistics [Line Items]        
Net trading 69,486 73,167 70,809  
New issue and advisory 6,021 3,585 3,778  
Principal transactions and other income 166 199 (125)  
Total revenues 75,673 76,951 74,462  
Total operating expenses 74,595 79,986 56,313  
Operating income / (loss) 1,078 (3,035) 18,149  
Income / (loss) from equity method affiliates   (204)    
Other non operating income / (expense) (3,554) 386    
Income / (loss) before income tax expense / (benefit) (2,476) (2,853) 18,149  
Income tax expense / (benefit) 49      
Net income / (loss) (2,525) (2,853) 18,149  
Less: Net income / (loss) attributable to the non-controlling interest (216) (1,768)    
Net income / (loss) attributable to IFMI (2,309) (1,085) 18,149  
Other statement of operations data:        
Depreciation and amortization (included in total operating expense) 859 596    
Balance sheet data:        
Total assets 279,863 352,817 200,207  
Asset Management [Member]
        
Operating Statistics [Line Items]        
Asset management 23,172 21,698 25,281  
Principal transactions and other income 894 1,316 475  
Total revenues 24,066 23,014 25,756  
Total operating expenses 8,690 6,017 20,711  
Operating income / (loss) 15,376 16,997 5,045  
Income / (loss) from equity method affiliates 3,309 5,329 5,621  
Other non operating income / (expense)     970  
Income / (loss) before income tax expense / (benefit) 18,685 22,326 11,636  
Net income / (loss) 18,685 22,326 11,636  
Net income / (loss) attributable to IFMI 18,685 22,326 11,636  
Other statement of operations data:        
Depreciation and amortization (included in total operating expense) 17 15 600  
Balance sheet data:        
Total assets 7,257 7,972 26,069  
Investment in equity method affiliates (included in total assets) 493 1,150 502  
Principal Investing [Member]
        
Operating Statistics [Line Items]        
Principal transactions and other income (3,499) 366 25,334  
Total revenues (3,499) 366 25,334  
Total operating expenses 347 690 2,261  
Operating income / (loss) (3,846) (324) 23,073  
Income / (loss) from equity method affiliates 1,743 1,107 263  
Income / (loss) before income tax expense / (benefit) (2,103) 783 23,336  
Net income / (loss) (2,103) 783 23,336  
Net income / (loss) attributable to IFMI (2,103) 783 23,336  
Balance sheet data:        
Total assets 39,741 47,696 43,481  
Investment in equity method affiliates (included in total assets) 1,417 4,926 1,604  
Segment Total [Member]
        
Operating Statistics [Line Items]        
Net trading 69,486 73,167 70,809  
Asset management 23,172 21,698 25,281  
New issue and advisory 6,021 3,585 3,778  
Principal transactions and other income (2,439) 1,881 25,684  
Total revenues 96,240 100,331 125,552  
Total operating expenses 83,632 86,693 79,285  
Operating income / (loss) 12,608 13,638 46,267  
Income / (loss) from equity method affiliates 5,052 6,232 5,884  
Other non operating income / (expense) (3,554) 386 970  
Income / (loss) before income tax expense / (benefit) 14,106 20,256 53,121  
Income tax expense / (benefit) 49      
Net income / (loss) 14,057 20,256 53,121  
Less: Net income / (loss) attributable to the non-controlling interest (216) (1,768)    
Net income / (loss) attributable to IFMI 14,273 22,024 53,121  
Other statement of operations data:        
Depreciation and amortization (included in total operating expense) 876 611 600  
Balance sheet data:        
Total assets 326,861 408,485 269,757  
Investment in equity method affiliates (included in total assets) 1,910 6,076 2,106  
Unallocated [Member]
        
Operating Statistics [Line Items]        
New issue and advisory (1,000)      
Total revenues (1,000)      
Total operating expenses 11,313 31,803 37,525  
Operating income / (loss) (12,313) (31,803) (37,525)  
Other non operating income / (expense) (4,449) (6,329) (5,130)  
Income / (loss) before income tax expense / (benefit) (16,762) (38,132) (42,655)  
Income tax expense / (benefit) (664) (1,149) (749)  
Net income / (loss) (16,098) (36,983) (41,906)  
Less: Net income / (loss) attributable to the non-controlling interest (857) (5,571) 3,620  
Net income / (loss) attributable to IFMI (15,241) (31,412) (45,526)  
Other statement of operations data:        
Depreciation and amortization (included in total operating expense) 429 1,627 1,756  
Balance sheet data:        
Total assets $ 14,140 $ 12,105 $ 36,990