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Stock-Based Compensation (Detail) - (Table 4) - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Weighted average fair value $ 8.81 $ 10.07
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Volatility 22.40% 28.80%
Risk free interest rate 0.99% 1.06%
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 28.30% 31.80%
Risk free interest rate 1.60% 1.80%
Expected life in years 5 years 1 month 5 years 1 month