Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 29, 2018	Sep. 29, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 9,140,000	$ 9,140,000	$ 8,700,000
Property, plant and equipment, net	5,151,302	5,151,302	$ 5,093,147
Impairment of assets	110,000	110,000
Carrying Value of Two Field of Wells [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	72,400	72,400
Impairment of assets		110,000
Carrying Value of Third Field of Wells [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 53,300	$ 53,300

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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