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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
9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding 547,014 573,632 591,532 626,845
Weighted Average Exercise Price, Outstanding $ 9.31 $ 9.31 $ 9.29 $ 9.25
Weighted Average Exercisable, Exercise Price $ 7.87 $ 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 547,014      
Number of Shares, Expected to Vest 540,064      
Number of Shares, Exercisable 328,857      
Weighted Average Exercise Price, Outstanding $ 9.31      
Weighted Average Exercise Price, Expected to Vest 9.29      
Weighted Average Exercisable, Exercise Price $ 7.87      
Weighted Average Remaining Life, Outstanding 70 months      
Weighted Average Remaining Contractual Life, Expected to Vest 70 months      
Weighted Average Remaining Contractual Life, Exercisable 51 months      
Intrinsic Value, Outstanding $ 3,690      
Intrinsic Value, Expected to Vest 3,658      
Intrinsic Value, Exercisable $ 2,693      
Performance Incentive Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding 82,334      
Number of Shares, Expected to Vest 73,632      
Weighted Average Exercise Price, Outstanding $ 11.49      
Weighted Average Exercise Price, Expected to Vest $ 11.49      
Weighted Average Remaining Life, Outstanding 15 months      
Weighted Average Remaining Contractual Life, Expected to Vest 15 months      
Intrinsic Value, Outstanding $ 376      
Intrinsic Value, Expected to Vest $ 336