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Non Vested Stock Option Activity (Parenthetical) (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
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Feb. 11, 2011 Subject to Certain Terms Equity Incentive Plan | Dec. 31, 2012 Subject to Certain Terms Equity Incentive Plan | May 09, 2012 Scenario, Adjustment | Dec. 31, 2012 Scenario, Adjustment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options not granted under the Equity Incentive Plan |  |  | 5,249,140 | 100,000 |  |
Equitable adjustment to reduce exercise price |  |  |  |  | $ 3.71 | $ 3.71
Option exercisable, weighted average remaining contractual term | 7 years 10 months 6 days | 8 years 9 months |  |  |  |
Aggregate intrinsic value | $ 1.6 | $ 1.2 |  |  |  |

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- Definition Equitable Adjustment that reduced the stock options exercise price. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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