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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1,956 $ 2,090 $ 4,196 $ 2,570
Cost of Sales [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 180   655  
Selling [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense 89   372  
Administrative [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock compensation expense $ 1,687 $ 2,090 $ 3,169 $ 2,570