Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Salaries, wages, payroll taxes and benefits	$ 29,284	$ 37,627
Workers' compensation liability	68,754	70,847
Property, sales, use and other taxes	15,017	10,666
Insurance, other than workers' compensation	8,240	8,462
Accrued interest payable	10,704	11,325
Accrued restructuring expenses	8,114	14,310
Other	24,066	21,767
Accrued liabilities	$ 164,179	$ 175,004