Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 4,000	$ 4,300
Accrued compensation	17,879		$ 18,212
Workers' compensation expense	$ 4,100	$ 3,000
Common stock granted, shares	77,254
Unrecognized compensation expense	$ 2,700
Compensation cost not yet recognized, period for recognition	2 years
Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 100
Unrecognized compensation expense	$ 3,000
Compensation cost not yet recognized, period for recognition	2 years 7 months 6 days
Directors [Member] | Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Common stock granted, shares	0	0
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares surrendered to satisfy tax withholding obligations	1,000
Share based compensation, recognized tax benefits	$ 100	$ 200
Common stock shares available for issuance	2,600,000
2014 Omnibus Incentive Plan [Member] | Non-Performance-Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 400	500
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 1,800	$ 1,700