Accounts Payable and Accrued Expenses - Components of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accounts payable	$ 416,847	$ 392,646
Payroll and benefits, including incentive compensation	101,315	138,805
Health insurance, workers’ compensation and other insurance costs	60,357	62,277
Current derivative liability	12	10,023
Customer rebates	41,919	49,053
Other accrued liabilities	86,531	89,184
Total	$ 706,981	$ 741,988