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Stock-Based Compensation (Detail) - Weighted Average Assumptions To Estimate The Fair Value Of Equity Awards (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Stock options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Risk-free rate | 0.93% | 1.11% | 1.44% |
| Expected volatility | 61.00% | 61.00% | 59.00% |
| Expected term (in years) | 6 years 1 month 5 days | 6 years 0 months 0 days | 6 years 4 months 30 days |
| Grant date fair value | $ 7.39 | $ 9.02 | $ 7.81 |
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Performance-based restricted stock units with a market condition [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Risk-free rate | 0.59% | ||
| Expected volatility | 53.00% | ||
| Grant date fair value | $ 6.39 | ||