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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
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 591,532 626,845
Weighted Average Exercise Price, Outstanding $ 9.29 $ 9.25
Weighted Average Exercisable, Exercise Price $ 7.84 $ 7.73
Incentive Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 591,532  
Number of Shares, Expected to Vest 582,606  
Number of Shares, Exercisable 357,257  
Weighted Average Exercise Price, Outstanding $ 9.29  
Weighted Average Exercise Price, Expected to Vest 9.25  
Weighted Average Exercisable, Exercise Price $ 7.84  
Weighted Average Remaining Life, Outstanding 76 months  
Weighted Average Remaining Contractual Life, Expected to Vest 76 months  
Weighted Average Remaining Contractual Life, Exercisable 57 months  
Intrinsic Value, Outstanding $ 3,841  
Intrinsic Value, Expected to Vest 3,803  
Intrinsic Value, Exercisable $ 2,836  
Performance Based Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted Average Exercise Price, Outstanding $ 11.49  
Weighted Average Exercise Price, Expected to Vest $ 11.49  
Weighted Average Remaining Life, Outstanding 21 months  
Weighted Average Remaining Contractual Life, Expected to Vest 21 months  
Weighted Average Remaining Contractual Life, Exercisable 0 months  
Intrinsic Value, Outstanding $ 384  
Intrinsic Value, Expected to Vest $ 230