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Weighted Average Assumptions used in Black-Scholes Option Valuation Model for Stock Options Granted (Parenthetical) (Detail) (2006 Equity Incentive Plan, Chief Executive Officer)
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1 Months Ended |
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Mar. 31, 2012
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2006 Equity Incentive Plan | Chief Executive Officer
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| Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items] | |
| Stock options granted that are subject to performance condition | 100,000 |