SUPPLEMENTAL OIL AND GAS DISCLOSURES (Unaudited) - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 MMBoe MBbls	Dec. 31, 2016 MBbls	Dec. 31, 2015 MBbls
Reserve Quantities [Line Items]
Sales of minerals in-place	211,998	6,983	384,827
Purchases of minerals in-place	2,285	1,580	6,860
Extensions, discoveries and other additions	229,977	103,204	117,405
Changes in reserves accounted	10,394	(159,341)	(365,135)
Percentage of estimated proved developed reserves classified as proved not producing	9.00%
North America
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	169
Premian Basin
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	128
Canada
Reserve Quantities [Line Items]
Sales of minerals in-place	205,683	6,852	55,228
Purchases of minerals in-place	1,294	0	6,860
Extensions, discoveries and other additions	24,115	9,166	26,226
Extensions, discoveries and other additions \| MMBoe	24
Changes in reserves accounted	16,136	(84,984)	(87,081)
MidContinent Region
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	17
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	40,731	23,674	40,464
Extensions, discoveries and other additions \| MMBoe	41
Changes in reserves accounted	(21,936)	16,599	37,825
North Sea
Reserve Quantities [Line Items]
Sales of minerals in-place	0	0	2,080
Purchases of minerals in-place	0	1,556	0
Extensions, discoveries and other additions	19,809	13,906	24,227
Extensions, discoveries and other additions \| MMBoe	20
Changes in reserves accounted	3,291	(3,002)	(6,305)
International Regions
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	61
Changes in Product Prices
Reserve Quantities [Line Items]
Changes in reserves accounted	32
Changes in Engineering and Performance
Reserve Quantities [Line Items]
Changes in reserves accounted	22

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.

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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/presentationRef
-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/presentationRef
-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/presentationRef
-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/presentationRef
-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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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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