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Employee Benefits - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Installments shares	Sep. 30, 2018 USD ($) Installments shares	Dec. 31, 2018 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 5,600	$ 4,500	$ 15,700	$ 13,300
Accrued compensation	32,793		32,793		$ 27,923
Administration expense related to employee contribution plan	500	300	1,500	1,200
Share-based compensation expense	2,099	1,893	6,441	6,089
Unrecognized compensation expense	5,900		$ 5,900
Compensation cost not yet recognized, period for recognition			1 year 10 months 24 days
Cost of Sales [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Workers' compensation expense	4,000	4,400	$ 11,800	9,700
Share-based compensation expense	97	94	280	749
Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	1,954	1,769	6,012	4,938
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	200	300	500	1,500
Unrecognized compensation expense	400		$ 400
Compensation cost not yet recognized, period for recognition			7 months 6 days
Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares | shares			82,692
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	25	$ 300	$ 100
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares | shares			46,000	100,000
Number of equal installments for common stock | Installments			3	3
Number of shares surrendered to satisfy tax withholding obligations | shares			45,000	41,000
Share based compensation, recognized tax benefits			$ 300	$ 500
Number of shares granted | shares			46,000	100,000
2014 Omnibus Incentive Plan [Member] | Common Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares | shares			8,000	5,000
Number of shares granted | shares			8,000	5,000
2014 Omnibus Incentive Plan [Member] | Non-Performance-Based Awards [Member] | Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	1,000	1,000	$ 3,300	$ 2,900
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	800	$ 600	$ 2,300	$ 1,600
Number of equal installments for common stock | Installments			2
Unrecognized compensation expense	4,200		$ 4,200
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	$ 2,900		$ 2,900		$ 2,300

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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