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Employee Benefits - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($) Installments	Mar. 31, 2019	Jun. 30, 2018 USD ($) Installments	Jun. 30, 2019 USD ($) Installments shares	Jun. 30, 2018 USD ($) Installments shares	Dec. 31, 2018 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 5,300		$ 4,400	$ 10,100	$ 8,800
Accrued compensation	26,964			26,964		$ 27,923
Administration expense related to employee contribution plan	400		500	1,000	900
Share-based compensation expense	2,404		1,956	4,342	4,196
Unrecognized compensation expense	6,900			$ 6,900
Compensation cost not yet recognized, period for recognition				2 years 1 month 6 days
Cost of Sales [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Workers' compensation expense	3,600		1,500	$ 7,800	5,300
Share-based compensation expense	105		180	183	655
Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	2,242		1,687	4,058	3,169
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	200		300	300	1,200
Unrecognized compensation expense	500			$ 500
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]
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	$ 200	$ 25
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	3	3
Number of shares surrendered to satisfy tax withholding obligations | shares				45,000	41,000
Share based compensation, recognized tax benefits	$ 300		$ 400	$ 300	$ 500
Number of shares granted | shares				46,000	100,000
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	1,200		1,000	$ 2,300	$ 1,900
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	$ 1,500	$ 1,000
Number of equal installments for common stock | Installments				2
Unrecognized compensation expense	5,000			$ 5,000
Compensation cost not yet recognized, period for recognition		2 years
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 2,700			$ 2,700		$ 2,300

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- Definition

Health insurance expense.

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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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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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