Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,594,782	$ 14,525,075
Less accumulated depreciation	(9,416,227)	(9,190,327)
Property, plant and equipment, net, total	6,178,555	5,334,748
Land and Improvements, Net [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	719,736	654,786
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,413,690	1,283,182
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,630,179	11,101,840
Proved Oil and Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	558,123	557,383
Leasehold Interest in Unproved Oil and Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	165,000	165,000
Construction in Process and Equipment Deposits [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,108,054	$ 762,884