Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Line Items]
Trade accounts payable	$ 72,689	$ 49,825
Accrued salaries and wages	28,871	58,173
Accrued dividends	65,232	61,129
Accrued workers' compensation and auto liability	6,978	7,727
Accrued litigation	4,176	4,323
Accrued employee medical insurance	7,911	8,530
Accrued property taxes	24,796	24,522
Accrued interest	9,780	6,435
Deferred revenue	31,844	5,725
Construction payable	8,483	64,995
Lease financing obligation	19,775
Other	37,140	26,182
Accounts payable and accrued expenses, total	$ 317,675	$ 317,566