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v3.19.1

Employee Benefits - Additional Information (Detail) $ in Thousands, Unit_pure in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) Installments shares | Mar. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Healthcare benefit expense, net of employee contributions | $ 4,800 | $ 4,400 |
Accrued compensation | 22,371 |  | $ 27,923
Administration expense related to employee contribution plan | 600 | 400 |
Share-based compensation expense | 1,938 | $ 2,240 |
Unrecognized compensation expense | $ 4,500 |  |
Compensation cost not yet recognized, period for recognition | 1 year 9 months 18 days |  |
Common Stock [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Number of shares granted | shares | 11,000 | 8,000 |
Cost of Sales [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Workers' compensation expense | $ 4,200 | $ 3,800 |
Share-based compensation expense | 78 | 475 |
Performance Based Restricted Stock Units [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based compensation expense | 100 | 900 |
Unrecognized compensation expense | $ 34,000 |  |
Compensation cost not yet recognized, period for recognition | 1 month 6 days |  |
Non-Performance-Based Awards [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based compensation expense | $ 1,100 | 900 |
Performance Based Awards [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Number of shares granted | shares | 82,692 |  |
Board of Directors [Member] | Restricted Stock [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based compensation expense | $ 100 | $ 100 |
2014 Omnibus Incentive Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Number of equal installments for common stock | Installments | 2 |  |
Number of shares granted | shares | 46,000 |  |
2014 Omnibus Incentive Plan [Member] | Officer [Member] | Performance Shares [Member] | Common Stock [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Number of equal installments for common stock |  | 0.1 |
Number of shares granted | shares | 2 |  |
2014 Omnibus Incentive Plan [Member] | Officer [Member] | Performance Based Awards [Member] | Common Stock [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based compensation expense | $ 700 | $ 400 |
Unrecognized compensation expense | $ 5,800 |  |
Compensation cost not yet recognized, period for recognition | 2 years 1 month 6 days |  |
Medical IBNR Included in Accrued Compensation [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Accrued compensation | $ 2,700 |  | $ 2,300

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