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 |