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Stock-Based Compensation (Detail) - (Table 4) - $ / shares
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend yield     0.00% 0.00%
Weighted average fair value     $ 7.01 $ 8.81
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility 22.20% 22.40%    
Risk free interest rate 0.86% 99.00%    
Expected life in years 3 years 5 months 4 years 1 month    
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Volatility 26.20% 28.30%    
Risk free interest rate 1.73% 1.60%    
Expected life in years 5 years 5 years 1 month