Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 96,642	$ 53,230
Accrued salaries and wages	42,556	39,411
Accrued dividends	52,572	51,156
Accrued workers' compensation and auto liability	6,901	6,737
Accrued litigation	13,937	7,822
Accrued employee medical insurance	5,442	6,506
Accrued property taxes	27,288	28,473
Accrued interest	12,957	11,949
Deferred revenue	15,173	13,633
Construction payable	21,099	3,903
Lease financing obligation	12,771	11,612
Other	42,749	43,372
Accounts payable and accrued expenses, total	$ 350,087	$ 277,804