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Equity - Summary of Company Expenses Compensation Costs Based on Grant Date Fair Value (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense $ 74 $ 64 $ 56
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 81 69 66
Omnibus Long Term Share Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense 155 133 122
Tax effect on stock-based compensation expense 18 24 26
Net effect $ 137 $ 109 $ 96