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Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 2,240 $ 480
Cost of Sales [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense 475  
Selling [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense 283  
Administrative [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 1,482 $ 480