Supplemental Crude Oil and Natural Gas Information - Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities (Detail)	12 Months Ended
Dec. 31, 2019 MBoe MMcf MBbls	Dec. 31, 2018 MBoe MMcf MBbls	Dec. 31, 2017 MBoe MMcf MBbls	Dec. 31, 2016 MBoe MMcf MBbls
Reserve Quantities [Line Items]
Proved Developed Reserves (MBOE)	707,424	675,206	601,901
Proved Undeveloped Reserve (MBOE)	911,841	847,159	729,094
Proved Developed and Undeveloped Reserve, Net (MBOE)	1,619,265	1,522,365	1,330,995	1,274,864
Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	88,307	76,994	77,779
Proved Developed Reserves (Volume) \| MBbls	336,405	347,825	318,707
Proved Undeveloped Reserve (Volume) \| MBbls	423,782	409,271	322,242
Proved Developed and Undeveloped Reserves, Net \| MBbls	760,187	757,096	640,949	643,228
Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MMcf	363,239	1,153,555	25,390
Proved Developed Reserves (Volume) \| MMcf	2,226,117	1,964,289	1,699,161
Proved Undeveloped Reserve (Volume) \| MMcf	2,928,354	2,627,325	2,441,120
Proved Developed and Undeveloped Reserves, Net \| MMcf	5,154,471	4,591,614	4,140,281	3,789,818
Change in development plans \| Proved Undeveloped Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates	35	234	89
Price Driven \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates	43	(26)	(42)
Other \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates	(14)	4	5
Instrument Type [Domain] \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates	85	57	30

Proved Developed And Undeveloped Reserve Revisions Of Previous Estimates Increase Decrease One

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- Definition

Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ 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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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ 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 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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Energy measure of interests in proved developed 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

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Net quantities of an enterprise's interests in proved developed reserves of either 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 as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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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.

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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 is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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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.

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