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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)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Expected to Vest 3,900
Performance Incentive Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding 81,666
Number of Shares, Expected to Vest 79,814
Weighted Average Exercise Price, Outstanding | $ / shares $ 11.49
Weighted Average Exercise Price, Expected to Vest | $ / shares $ 11.49
Weighted Average Remaining Life, Outstanding 3 months
Weighted Average Remaining Contractual Life, Expected to Vest 3 months
Intrinsic Value, Outstanding | $ $ 932
Intrinsic Value, Expected to Vest | $ $ 911