Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets related to:
Expenses not yet deducted for tax purposes	$ 266,628	$ 256,728
Pension liability not yet deducted for tax purposes	277,929	257,766
Net operating loss	29,785	31,046
Net deferred tax assets, gross	574,342	545,540
Deferred tax liabilities related to:
Employee and retiree benefits	218,124	210,429
Inventory	95,280	93,067
Other intangible assets	296,736	287,018
Property, plant, and equipment	72,463	66,727
Other	32,978	35,859
Deferred tax liabilities, total	715,581	693,100
Net deferred tax liability before valuation allowance	(141,239)	(147,560)
Valuation allowance	(26,095)	(5,590)
Total net deferred tax liability	$ (167,334)	$ (153,150)