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Stock-Based Compensation and Employee Benefit Plans - Fair Value of Stock Options (Detail) (Stock options [Member], USD $)
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9 Months Ended | |
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Sep. 30, 2012
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Sep. 30, 2011
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Stock options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Weighted-average grant date fair value per share | $ 2.37 | $ 4.26 |
| Risk-free interest rate | 0.88% | 2.01% |
| Dividend yield | ||
| Expected life (years) | 4 years 10 months 2 days | 5 years 18 days |
| Volatility | 55.91% | 51.83% |