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Permanent Equity and Restrictions - Summary of Share Transactions Occurred in Stockholders' Equity During the Year (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders Equity Note [Line Items] |  |  |
Forfeiture/cancellation of restricted stock |  | 1,348,361 |
Cancellation of Restricted Stock |  | 90,135 |
Restricted units of IFMI common stock granted |  | 90,135 |
Forfeited, restricted stock in connection with the separation, release, and repurchase agreements | 1,508,353 | 1,348,361 | 694
2009 Equity Award Plan [Member] |  |  |
Stockholders Equity Note [Line Items] |  |  |
Surrender of restricted stock | 116,595 |  |
PrinceRidge [Member] |  |  |
Stockholders Equity Note [Line Items] |  |  |
Forfeited, restricted stock in connection with the separation, release, and repurchase agreements | 848,742 |  |

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- Definition Surrender of restricted stock to the Company. + References No definition available. + Details
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- Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(e) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of shares (or other type of equity) forfeited during the period. + References No definition available. + Details
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