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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 6,591 $ 1,894
Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense 965  
Selling [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense 571  
Administrative [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 5,055 $ 1,894