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Stock-Based Compensation - Summary of Fair Value of Stock Option Awards (Detail)
9 Months Ended
Sep. 30, 2014
2014 Grants [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend yield 0.00%
Expected volatility 48.99%
Risk-free interest rate 1.97%
Expected life (in years) 6 years 18 days
2013 Grants[Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend yield 0.00%
Expected volatility 47.88%
Risk-free interest rate 1.97%
Expected life (in years) 5 years 9 months 22 days
2012 Grants [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend yield 0.00%
Expected volatility 43.69%
Risk-free interest rate 1.73%
Expected life (in years) 5 years 6 months 18 days
2011 Grants [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Dividend yield 0.00%
Expected volatility 41.58%
Risk-free interest rate 1.73%
Expected life (in years) 5 years 3 months 18 days