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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