Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Salaries, wages, payroll taxes and benefits	$ 21,138	$ 27,055
Workers' compensation liability	67,775	75,358
Property, sales, use and other taxes	6,766	9,061
Insurance, other than workers' compensation	9,566	12,817
Accrued interest payable	6,740	7,668
Other	27,163	29,652
Accrued expenses	$ 139,148	$ 161,611