Employee Benefits - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) Installments shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 5,500	$ 5,600	$ 18,200	$ 15,700
Accrued compensation	43,310		43,310		$ 33,636
Administration expense related to employee contribution plan	400	500	1,600	1,500
Share-based compensation expense	2,635	2,099	8,050	6,441
Unrecognized compensation expense	7,100		$ 7,100
Compensation cost not yet recognized, period for recognition			2 years
Cost of Sales [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Workers' compensation expense	4,100	4,000	$ 11,400	11,800
Share-based compensation expense	60	97	221	280
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	100	$ 200	400	500
Unrecognized compensation expense	300		$ 300
Compensation cost not yet recognized, period for recognition			6 months
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		$ 1,200	$ 100
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted | shares			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
Employee sharebased compensation windfall tax windfall				$ 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	$ 200	$ 300
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	1,000	$ 3,000	$ 3,300
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		$ 2,300
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		$ 2,800
Number of equal installments for common stock | Installments			2
Unrecognized compensation expense	5,000		$ 5,000
Compensation cost not yet recognized, period for recognition			1 year 9 months 18 days
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 3,200		$ 3,200		$ 2,600