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Employee Benefits - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) Installments shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Healthcare benefit expense, net of employee contributions | $ 5,500 | $ 5,600 | $ 18,200 | $ 15,700 |
Accrued compensation | 43,310 |  | 43,310 |  | $ 33,636
Administration expense related to employee contribution plan | 400 | 500 | 1,600 | 1,500 |
Share-based compensation expense | 2,635 | 2,099 | 8,050 | 6,441 |
Unrecognized compensation expense | 7,100 |  | $ 7,100 |  |
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 | 4,100 | 4,000 | $ 11,400 | 11,800 |
Share-based compensation expense | 60 | 97 | 221 | 280 |
Performance Based Restricted Stock Units [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Share-based compensation expense | 100 | $ 200 | 400 | 500 |
Unrecognized compensation expense | 300 |  | $ 300 |  |
Compensation cost not yet recognized, period for recognition |  |  | 6 months |  |
Performance Based Awards [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Number of shares granted | shares |  |  | 57,450 |  |
Long Term Performance Based Restricted Stock Awards [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Share-based compensation expense | $ 500 |  | $ 1,200 | $ 100 |
2014 Omnibus Incentive Plan [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Number of shares granted | shares |  |  | 100,000 |  |
Number of shares surrendered to satisfy tax withholding obligations | shares |  |  | 25,000 | 45,000 |
Common stock shares available for issuance | shares | 2,000,000.0 |  | 2,000,000.0 |  |
Common stock shares authorized | shares | 3,000,000.0 |  | 3,000,000.0 |  |
Employee sharebased compensation tax shortfall |  |  | $ 300 |  |
Employee sharebased compensation windfall tax windfall |  |  |  | $ 300 |
2014 Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Number of shares granted | shares | 6,000 | 6,000 | 8,000 | 8,000 |
Share-based compensation expense | $ 100 | $ 100 | $ 200 | $ 300 |
2014 Omnibus Incentive Plan [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Number of shares granted | shares |  |  | 200,000 | 100,000 |
2014 Omnibus Incentive Plan [Member] | Non-Performance-Based Awards [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Share-based compensation expense | 1,000 | 1,000 | $ 3,000 | $ 3,300 |
2014 Omnibus Incentive Plan [Member] | Officer [Member] | Non-Performance-Based Awards [Member] | Common Stock [Member] |  |  |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 800 |  | $ 2,300 |
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 | 900 |  | $ 2,800 |  |
Number of equal installments for common stock | Installments |  |  | 2 |  |
Unrecognized compensation expense | 5,000 |  | $ 5,000 |  |
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 | $ 3,200 |  | $ 3,200 |  | $ 2,600

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