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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 573,632 591,532 626,845
Weighted Average Exercise Price, Outstanding $ 9.31 $ 9.29 $ 9.25
Weighted Average Exercisable, Exercise Price $ 7.85 $ 7.84 $ 7.73
Incentive Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 573,632    
Number of Shares, Expected to Vest 565,767    
Number of Shares, Exercisable 344,357    
Weighted Average Exercise Price, Outstanding $ 9.31    
Weighted Average Exercise Price, Expected to Vest 9.28    
Weighted Average Exercisable, Exercise Price $ 7.85    
Weighted Average Remaining Life, Outstanding 73 months    
Weighted Average Remaining Contractual Life, Expected to Vest 73 months    
Weighted Average Remaining Contractual Life, Exercisable 54 months    
Intrinsic Value, Outstanding $ 3,329    
Intrinsic Value, Expected to Vest 3,300    
Intrinsic Value, Exercisable $ 2,499    
Performance Based Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding 89,464 89,464 98,410
Number of Shares, Expected to Vest 81,546    
Weighted Average Exercise Price, Outstanding $ 11.49 $ 11.49 $ 11.49
Weighted Average Exercise Price, Expected to Vest $ 11.49    
Weighted Average Remaining Life, Outstanding 18 months    
Weighted Average Remaining Contractual Life, Expected to Vest 18 months    
Intrinsic Value, Outstanding $ 324    
Intrinsic Value, Expected to Vest $ 295