Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) Installments $ / shares shares	Dec. 31, 2018 USD ($) Installments $ / shares shares	Dec. 31, 2017 USD ($) Installments $ / shares shares
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 21,900	$ 17,800	$ 17,400
Accrued compensation	33,636	27,923
Administration expense related to employee contribution plan	2,000	1,700	1,600
Share-based compensation expense	8,727	7,846	6,591
Unrecognized compensation expense	$ 4,800
Compensation cost not yet recognized, period for recognition	1 year 9 months 18 days
Cost of Sales [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Workers' compensation expense	$ 15,400	12,800	13,500
Share-based compensation expense	374	846	965
Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 8,159	6,549	5,055
Performance Based Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted \| shares	13,933
Grant date fair value for restricted stock granted \| $ / shares	$ 56.05
Unrecognized compensation expense	$ 200
Compensation cost not yet recognized, period for recognition	3 months 18 days
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 700	$ 1,600	$ 2,600
Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted \| shares	82,692
Grant date fair value for restricted stock granted \| $ / shares	$ 41.00
Directors [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted \| shares	8,000	5,000	6,000
Grant date fair value for restricted stock granted \| $ / shares	$ 52.13	$ 60.65	$ 50.50
Share-based compensation expense	$ 400	$ 200	$ 300
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted \| shares	100,000	100,000	100,000
Number of equal installments for common stock \| Installments	3	3	3
Number of shares surrendered to satisfy tax withholding obligations \| shares	45	41,000	11,000
Share based compensation, recognized tax benefits	$ 300	$ 500	$ 600
Common stock shares available for issuance \| shares	2,200,000
Common stock shares authorized \| shares	3,000,000.0
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	$ 4,300	4,000	2,700
2014 Omnibus Incentive Plan [Member] \| Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares granted \| shares	83,000
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	$ 3,000	2,000	$ 1,000
Number of equal installments for common stock \| Installments	2
Unrecognized compensation expense	$ 3,500
Compensation cost not yet recognized, period for recognition	1 year 7 months 6 days
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 2,600	$ 2,300

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Pension plans, postretirement and other employee benefits.

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Number of equal installments for vesting restricted stock.

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All expenses associated with Worker's Compensation Insurance benefits incurred during the period.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of administrative expense incurred by defined contribution plan.

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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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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of shares authorized for issuance under share-based payment arrangement.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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