Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Salaries, wages, payroll taxes and benefits	$ 22,631	$ 27,055
Workers' compensation liability	72,322	75,358
Property, sales, use and other taxes	3,547	9,061
Insurance, other than workers' compensation	12,606	12,817
Accrued interest payable	13,951	7,668
Other	29,382	29,652
Accrued expenses	$ 154,439	$ 161,611