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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 2,404 $ 1,956 $ 4,342 $ 4,196
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 105 180 183 655
Selling [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 57 89 101 372
Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 2,242 $ 1,687 $ 4,058 $ 3,169