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Employee Benefits - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
Installments
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Healthcare benefit expense, net of employee contributions $ 5,700 $ 5,300 $ 12,700 $ 10,100  
Accrued compensation 36,520   36,520   $ 33,636
Administration expense related to employee contribution plan 600 400 1,200 1,000  
Share-based compensation expense 2,733 2,404 5,415 4,342  
Unrecognized compensation expense 8,100   $ 8,100    
Compensation cost not yet recognized, period for recognition     2 years 2 months 12 days    
Cost of Sales [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Workers' compensation expense 2,900 3,600 $ 7,300 7,800  
Share-based compensation expense 65 105 161 183  
Performance Based Restricted Stock Units [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based compensation expense 100 200 300 $ 300  
Unrecognized compensation expense 400   $ 400    
Compensation cost not yet recognized, period for recognition     9 months 18 days    
Performance Based Awards [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Number of shares granted | shares     57,450    
Long Term Performance Based Restricted Stock Awards [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based compensation expense $ 500   $ 700    
2014 Omnibus Incentive Plan [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Number of shares granted | shares 200,000   100,000    
Number of shares surrendered to satisfy tax withholding obligations | shares     25,000 45,000  
Common stock shares available for issuance | shares 2,000,000.0   2,000,000.0    
Common stock shares authorized | shares 3,000,000.0   3,000,000.0    
Employee sharebased compensation tax shortfall $ 300   $ 300    
Employee sharebased compensation windfall tax windfall $ 300 $ 300 $ 300 $ 300  
2014 Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Nonemployee [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Number of shares granted | shares 6,000 6,000 8,000 8,000  
Share-based compensation expense $ 100 $ 100 $ 100 $ 200  
2014 Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Employee [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Number of shares granted | shares   200,000   100,000  
2014 Omnibus Incentive Plan [Member] | Non-Performance-Based Awards [Member] | Share-based Payment Arrangement, Employee [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based compensation expense 1,000 $ 1,200 $ 2,000 $ 2,300  
2014 Omnibus Incentive Plan [Member] | Officer [Member] | Non-Performance-Based Awards [Member] | Common Stock [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Share-based compensation expense   $ 800   1,500  
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 900     $ 1,900  
Number of equal installments for common stock | Installments     2    
Unrecognized compensation expense 6,000   $ 6,000    
Compensation cost not yet recognized, period for recognition     1 year 10 months 24 days    
Medical IBNR Included in Accrued Compensation [Member]          
Pension Plans, Postretirement and Other Employee Benefits [Line Items]          
Accrued compensation $ 3,300   $ 3,300   $ 2,600