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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Proved Undeveloped Reserves (Detail)	12 Months Ended
	Dec. 31, 2019 MMcfe
Extractive Industries [Abstract]
Beginning proved undeveloped reserves at December 31, 2018	8,315,536
Undeveloped reserves transferred to developed	(1,215,684)
Revisions	265,947	[1]
Sales	(214,637)
Extension and discoveries	1,137,953
Ending proved undeveloped reserves at December 31, 2019	8,289,115
[1] Includes 601 Bcfe of proved undeveloped reserves removed and deferred due to the five-year rule which can be included in our future proved reserves as these locations are added back to our five-year development plan.

X

- Definition

Volumetric amount of increase (decrease) as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.

+ References

No definition available.

+ Details

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- Definition

Proved undeveloped reserves purchases and sales.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in proved undeveloped reserves as a result of revisions of estimated quantity.

+ References

No definition available.

+ Details

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X

- Definition

Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that transferred to proved developed reserves by the end of the period.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447

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