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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) - Performance Incentive Stock Option Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 140,411 81,666
Number of Shares, Expected to Vest 140,411 81,666
Number of Shares, Exercisable 140,411 81,666
Weighted Average Exercise Price, Outstanding $ 11.49 $ 11.49
Weighted Average Exercise Price, Expected to Vest 11.49 11.49
Weighted Average Exercisable, Exercise Price $ 11.49 $ 11.49
Weighted Average Remaining Life, Outstanding 72 months 84 months
Weighted Average Remaining Contractual Life, Expected to Vest 72 months 84 months
Weighted Average Remaining Contractual Life, Exercisable 72 months 84 months
Intrinsic Value, Outstanding $ 520 $ 666
Intrinsic Value, Expected to Vest 520 666
Intrinsic Value, Exercisable $ 520 $ 666