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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1,893 $ 2,179 $ 6,089 $ 4,749
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 94 507 749 507
Selling [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 30 292 402 292
Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1,769 $ 1,380 $ 4,938 $ 3,950