Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets related to:
Expenses not yet deducted for tax purposes	$ 345,195	$ 318,368
Pension liability not yet deducted for tax purposes	397,391	347,263
Deferred tax assets, total	742,586	665,631
Deferred tax liabilities related to:
Employee and retiree benefits	276,256	249,126
Inventory	141,181	147,199
Other intangible assets	120,689	111,305
Property, plant, and equipment	61,666	58,496
Other	58,468	31,664
Deferred tax liabilities, total	658,260	597,790
Net deferred tax assets	$ 84,326	$ 67,841