Property, Plant and Equipment - Additional Information (Detail) $ in Thousands	Apr. 03, 2021 USD ($) a	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 10,030,000	$ 9,860,000
Property, plant and equipment, net	7,031,688	6,899,110
Carrying Value of Three Groups of Wells [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	69,900	$ 71,700
Unproved Oil and Natural Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 138,000
Ownership percentage of leasehold interest in unproved oil and natural gas properties	49.00%
Unproved oil and gas properties area \| a	54,000

Ownership percentage of leasehold interest in unproved oil and gas properties.

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- Definition

Unproved oil and gas properties area.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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-Paragraph 1
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-Topic 210
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-Section S99
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-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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