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Summary of Stock Options Summarized by Exercise Price (Detail) - $ / shares
6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Weighted Average, Exercise Price $ 9.29 $ 9.21 $ 9.22
Exercisable Weighted Average, Exercise Price $ 7.72 $ 7.71 7.82
Incentive Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Weighted Average, Shares 660,573    
Outstanding Weighted Average, Remaining Life (Months) 85 months    
Outstanding Weighted Average, Exercise Price $ 9.29    
Exercisable Weighted Average, Shares 386,429    
Exercisable Weighted Average, Exercise Price $ 7.72    
Incentive Stock Option Plan | Range One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Per Share, Lower Range $ 7.50    
Outstanding Weighted Average, Shares 369,750    
Outstanding Weighted Average, Remaining Life (Months) 64 months    
Outstanding Weighted Average, Exercise Price $ 7.50    
Exercisable Weighted Average, Shares 369,750    
Exercisable Weighted Average, Exercise Price $ 7.50    
Incentive Stock Option Plan | Range Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Per Share, Lower Range 11.32    
Exercise Price Per Share, Upper Range $ 14.75    
Outstanding Weighted Average, Shares 290,823    
Outstanding Weighted Average, Remaining Life (Months) 111 months    
Outstanding Weighted Average, Exercise Price $ 11.56    
Exercisable Weighted Average, Shares 16,679    
Exercisable Weighted Average, Exercise Price $ 12.69    
Performance Based Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding Weighted Average, Shares 107,689    
Outstanding Weighted Average, Remaining Life (Months) 30 months    
Outstanding Weighted Average, Exercise Price $ 11.49   $ 11.49
Performance Based Options | Range Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price Per Share, Lower Range $ 11.49    
Outstanding Weighted Average, Shares 107,689    
Outstanding Weighted Average, Remaining Life (Months) 30 months    
Outstanding Weighted Average, Exercise Price $ 11.49