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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 |

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