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Stock-Based Compensation (Detail) - (Table 4) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Weighted average fair value $ 10.07 $ 10.12
Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 28.80% 36.50%
Risk free interest rate 1.06% 0.37%
Expected life in years 4 years 1 month 4 years 1 month
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 31.80% 44.80%
Risk free interest rate 1.80% 1.26%
Expected life in years 5 years 1 month 5 years 1 month