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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 |  |

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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 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- 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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- 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 + Details
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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 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 + Details
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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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- 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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- 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 + Details
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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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