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Stock-Based Compensation (Detail) - (Table 3) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 0.00% 0.00% 0.00%
Weighted average fair value $ 9.43 $ 10.21 $ 7.31
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 40.00% 31.00% 43.00%
Risk free interest rate 0.47% 0.37% 0.61%
Expected life in years 3 years 4 years 2 years
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 47.00% 45.00% 49.00%
Risk free interest rate 0.87% 1.38% 1.78%
Expected life in years 5 years 5 years 4 years