Pension plans, postretirement and other employee benefits.

No definition available.

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- Definition

Number of equal installments for vesting restricted stock.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Amount of administrative expense incurred by defined contribution plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

+ Details

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Balance Type:	na
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Period Type:	duration

- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Balance Type:	na
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Installment $ / shares shares	Dec. 31, 2016 USD ($) Installment $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2017 shares
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 17,400	$ 15,200	$ 11,800
Accrued compensation	25,399	18,212
Administration expense related to employee contribution plan	1,600	1,300	800
Share-based compensation expense	6,591	1,894
Unrecognized compensation expense	$ 5,500
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	$ 13,500	12,100	$ 12,000
Share-based compensation expense	965
Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 5,055	$ 1,894
Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	77,254
Grant date fair value for restricted stock granted \| $ / shares	$ 0
Share-based compensation expense	$ 900
Unrecognized compensation expense	$ 1,700
Compensation cost not yet recognized, period for recognition	1 year 10 months 25 days
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	74,818
Grant date fair value for restricted stock granted \| $ / shares	$ 0
Share-based compensation expense	$ 2,600
Unrecognized compensation expense	$ 1,100
Compensation cost not yet recognized, period for recognition	3 months 19 days
Performance Based Restricted Stock Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 100
Compensation cost not yet recognized, period for recognition	4 years
Directors [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	6,000	9,000	13,000
Grant date fair value for restricted stock granted \| $ / shares	$ 50.50	$ 34.23	$ 22.74
Share-based compensation expense	$ 300	$ 300	$ 300
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares surrendered to satisfy tax withholding obligations \| shares	11,000
Share based compensation, recognized tax benefits	$ 600	300
Common stock shares available for issuance \| shares				2,600,000
2014 Omnibus Incentive Plan [Member] \| Common Stock Awards [Member] \| Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 2,700	$ 1,600
2014 Omnibus Incentive Plan [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	100,000	100,000
Number of equal installments for restricted stock \| Installment	3	3
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 1,800	$ 1,700