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Share-Based Payments - Additional Information (Detail) | 1 Months Ended |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2012 | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Restricted Stock Minimum | Mar. 31, 2013 Restricted Stock Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 1 year | 5 years
Number of stock warrants granted to third party in connection with acquisition | 1,500,000 |  |  |  |
Exercise price of warrants | 16.28 |  |  |  |
Warrants exercisable term | 5 years |  |  |  |
Stock warrants outstanding |  | 1,500,000 | 1,500,000 |  |
Weighted average exercise price of warrants outstanding |  | 16.28 | 16.28 |  |
Expiration date of warrants outstanding |  | 2017-09-12 |  |  |

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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + 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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