Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 49,866	$ 72,689
Accrued salaries and wages	29,766	28,871
Accrued dividends	51,496	65,232
Accrued workers' compensation and auto liability	6,652	6,978
Accrued litigation	9,290	4,176
Accrued employee medical insurance	8,413	7,911
Accrued property taxes	27,707	24,796
Accrued interest	9,526	9,780
Deferred revenue	14,332	31,844
Construction payable	7,845	8,483
Lease financing obligation	11,785	19,775
Other	33,429	37,140
Accounts payable and accrued expenses, total	$ 260,107	$ 317,675