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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- Definition

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.

+ References

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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.

+ References

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- 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

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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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Supplemental Crude Oil and Natural Gas Information - Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities (Detail)	12 Months Ended
	Dec. 31, 2018 MBoe MMcf MBbls	Dec. 31, 2017 MBoe MMcf MBbls	Dec. 31, 2016 MBoe MMcf MBbls	Dec. 31, 2015 MBoe MMcf
Reserve Quantities [Line Items]
Proved Developed Reserves (MBOE) \| MBoe	675,206	601,901	518,646
Proved Undeveloped Reserve (MBOE) \| MBoe	847,159	729,094	756,218
Proved Developed and Undeveloped Reserve, Net (MBOE) \| MBoe	1,522,365	1,330,995	1,274,864	1,225,811
Crude Oil [Member]
Reserve Quantities [Line Items]
Proved Developed Reserves (Volume) \| MBbls	347,825	318,707	290,210
Proved Undeveloped Reserve (Volume) \| MBbls	409,271	322,242	353,018
Proved Developed and Undeveloped Reserves, Net \| MBbls	757,096	640,949	643,228
Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates	1,153,555	25,390	63,057
Proved Developed Reserves (Volume)	1,964,289	1,699,161	1,370,620
Proved Undeveloped Reserve (Volume)	2,627,325	2,441,120	2,419,198
Proved Developed and Undeveloped Reserves, Net	4,591,614	4,140,281	3,789,818	3,151,786
Change in development plans \| Proved Undeveloped Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	234	(89)	70
Change in development plans \| Proved Undeveloped Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	74
Change in development plans \| Proved Undeveloped Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates	960
Price Driven \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	(26)	(42)	28
Price Driven \| Proved Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	21
Price Driven \| Proved Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates	(31)
Production Type \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	57	30
Production Type \| Proved Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	21
Production Type \| Proved Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates	216
Other \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	4	5	12
Other \| Proved Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	2
Other \| Proved Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates	11