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Performance Option 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, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Expected to Vest 19,760 3,900
Performance Incentive Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 141,425  
Number of Shares, Expected to Vest 141,425  
Number of Shares, Exercisable 141,425  
Weighted Average Exercise Price, Outstanding $ 11.49  
Weighted Average Exercise Price, Expected to Vest 11.49  
Weighted Average Exercisable, Exercise Price $ 11.49  
Weighted Average Remaining Life, Outstanding 78 months  
Weighted Average Remaining Contractual Life, Expected to Vest 78 months  
Weighted Average Remaining Contractual Life, Exercisable 78 months  
Intrinsic Value, Outstanding $ 1,621  
Intrinsic Value, Expected to Vest 1,621  
Intrinsic Value, Exercisable $ 1,621