SUPPLEMENTAL OIL AND GAS DISCLOSURES (Unaudited) - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018 MMBoe MBbls	Dec. 31, 2017 MBbls	Dec. 31, 2016 MBbls
Reserve Quantities [Line Items]
Sales of minerals in-place	59	211,998	6,983
Purchases of minerals in-place	331	2,285	1,580
Extensions, discoveries and other additions	302,509	229,977	103,204
Changes in reserves accounted	(73,319)	10,394	(159,341)
Percentage of estimated proved developed reserves classified as proved not producing	8.00%
North America
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	240
Premian Basin
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	217
MidContinent Region
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	20
International Regions
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	62
Egypt
Reserve Quantities [Line Items]
Sales of minerals in-place	0	0	0
Purchases of minerals in-place	0	0	0
Extensions, discoveries and other additions	35,849	40,731	23,674
Extensions, discoveries and other additions \| MMBoe	36
Changes in reserves accounted	(16,007)	(21,936)	16,599
North Sea
Reserve Quantities [Line Items]
Sales of minerals in-place	0	0	0
Purchases of minerals in-place	0	0	1,556
Extensions, discoveries and other additions	26,338	19,809	13,906
Extensions, discoveries and other additions \| MMBoe	26
Changes in reserves accounted	6,139	3,291	(3,002)
Changes in Product Prices
Reserve Quantities [Line Items]
Changes in reserves accounted	24
Interest Revisions
Reserve Quantities [Line Items]
Changes in reserves accounted	5
Changes in Engineering and Performance
Reserve Quantities [Line Items]
Changes in reserves accounted	44

Percentage of estimated proved developed reserves classified as proved not producing.

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- Definition

Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions BOE

+ References

No definition available.

+ Details

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- Definition

Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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

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- Definition

Purchase of minerals in place.

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

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- Definition

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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- Definition

Sales of minerals in place.

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

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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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