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

Proved Developed And Undeveloped Reserves Purchase Of Minerals In Place Boe

+ References

No definition available.

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- Definition

Proved developed and undeveloped reserves revisions of previous estimated reserves.

+ References

No definition available.

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- Definition

The anticipated timing of the inclusion of the costs in the amortization computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 12
-Section D
-Subsection 2

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 10
-Paragraph c
-Subparagraph 3(ii)(A)
-Article 4

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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=51678428&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=51678428&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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Supplemental Oil and Gas Disclosures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 MMBoe MBbls	Dec. 31, 2014 MBbls	Dec. 31, 2013 MBbls
Reserve Quantities [Line Items]
Anticipated Timing of Inclusion of Costs in Amortization Calculation	Five to ten years.
Purchases of minerals in-place	7
Sale of minerals in-place	384,827	357,526	355,431
Extensions, discoveries and other additions \| MMBoe	117
Combined downward revisions of previously estimated reserves	368
Changes in reserves accounted	(368,163)	11,404	32,539
Percentage of estimated proved developed reserves classified as proved not producing	9.00%
North America [Member]
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	53
Canada [Member]
Reserve Quantities [Line Items]
Sale of minerals in-place	55,228	91,548	132,246
Changes in reserves accounted	(87,081)	(2,800)	18,274
Egypt [Member]
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	40
Changes in reserves accounted	34,797	2,776	859
North Sea [Member]
Reserve Quantities [Line Items]
Sale of minerals in-place	2,080
Extensions, discoveries and other additions \| MMBoe	24
Changes in reserves accounted	(6,305)	(18)	24
Australia [Member]
Reserve Quantities [Line Items]
Sale of minerals in-place	327,287
Changes in reserves accounted	12,549	(216)	(135)
International Regions [Member]
Reserve Quantities [Line Items]
Extensions, discoveries and other additions \| MMBoe	64
Changes in Product Prices [Member]
Reserve Quantities [Line Items]
Changes in reserves accounted	339
Changes in Lease Ownership [Member]
Reserve Quantities [Line Items]
Changes in reserves accounted	16
Changes in Engineering and Performance [Member]
Reserve Quantities [Line Items]
Changes in reserves accounted	13