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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding 626,845 724,904 561,029 705,345
Weighted Average Exercise Price, Outstanding $ 9.25 $ 9.22 $ 7.76 $ 7.70
Weighted Average Exercisable, Exercise Price $ 7.73 $ 7.82 $ 7.70 $ 7.95
Incentive Stock Option Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding 626,845 724,904    
Number of Shares, Expected to Vest 616,987 713,172    
Number of Shares, Exercisable 373,929 447,879    
Weighted Average Exercise Price, Outstanding $ 9.25 $ 9.22    
Weighted Average Exercise Price, Expected to Vest 9.21 9.19    
Weighted Average Exercisable, Exercise Price $ 7.73 $ 7.82    
Weighted Average Remaining Life, Outstanding 79 months 90 months    
Weighted Average Remaining Contractual Life, Expected to Vest 78 months 89 months    
Weighted Average Remaining Contractual Life, Exercisable 59 months 71 months    
Intrinsic Value, Outstanding $ 2,990 $ 1,774    
Intrinsic Value, Expected to Vest 2,965 1,773    
Intrinsic Value, Exercisable $ 2,353 $ 1,738    
Performance Based Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding 98,410 107,689    
Number of Shares, Expected to Vest 58,410 107,689    
Weighted Average Exercise Price, Outstanding $ 11.49 $ 11.49    
Weighted Average Exercise Price, Expected to Vest $ 11.49 $ 11.49    
Weighted Average Remaining Life, Outstanding 24 months 36 months    
Weighted Average Remaining Contractual Life, Expected to Vest 24 months 36 months    
Weighted Average Remaining Contractual Life, Exercisable 0 months 0 months    
Intrinsic Value, Outstanding $ 248 $ 14    
Intrinsic Value, Expected to Vest $ 147 $ 14