Deferred Tax Assets Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Employee and retiree benefit plans	$ 37,393	$ 38,871
Depreciation and amortization	(185,321)	(172,766)
Inventories	12,615	11,229
Allowances and accruals	12,528	14,552
Interest rate exchange agreement	12,948	15,448
Other	2,800	4,626
Net deferred tax liabilities	$ (107,037)	$ (88,040)