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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense $ 10,826 $ 8,727 $ 7,846
Cost of sales      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense 284 374 846
Selling      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense 202 194 451
Administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense $ 10,340 $ 8,159 $ 6,549