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Equity-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 Time Based Restricted Stock | Dec. 31, 2012 Performance Based Restricted Stock | Dec. 31, 2012 Equity Incentive Plan | Apr. 25, 2012 Equity Incentive Plan Time Based Restricted Stock | Dec. 31, 2012 Equity Incentive Plan Time Based Restricted Stock | Apr. 25, 2012 Equity Incentive Plan Time Based Restricted Stock Executive officers | Apr. 25, 2012 Equity Incentive Plan Performance Based Restricted Stock | Apr. 25, 2012 Equity Incentive Plan Performance Based Restricted Stock Executive officers | Dec. 31, 2012 Equity Incentive Plan Stock Options | Jun. 07, 2012 Equity Incentive Plan Director | Feb. 11, 2011 Equity Incentive Plan Director | Dec. 31, 2012 2011 Equity Incentive Plan | Dec. 31, 2012 2011 Equity Incentive Plan Stock Options Minimum | Dec. 31, 2012 2011 Equity Incentive Plan Stock Options Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares provides for grants |  |  |  |  |  |  |  |  |  |  |  |  | 2,318,290 |  |
Term of option |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 10 years
Options granted |  |  |  | 940,000 |  |  |  |  |  |  | 15,288 | 4,000 |  |  |
Exercise price of options granted |  |  |  | $ 9.75 |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  | 3 years |  | 5 years |  |  |  |  |
Restricted shares awarded |  | 110,137 | 82,602 |  |  |  | 110,137 |  | 82,602 |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to non-vested awards | $ 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation non-vested awards period of recognition | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + 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 (i) -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 h -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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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