Supplementary Information - Reserve Quantity Information (Detail)	12 Months Ended
Dec. 31, 2014 MBbls	Dec. 31, 2013 MBbls
Oil [Member]
Proved Developed Reserves:
Beginning of year	6,687	7,178
Extensions, discoveries and improved recovery	186	87
Revisions of previous estimates	(278)	(361)
Converted from undeveloped reserves	407	513
Reserves sold	(4)
Reserves purchased	0	0
Production	(759)	(730)
End of year	6,239	6,687
Proved Undeveloped Reserves:
Beginning of year	9,066	5,907
Extensions, discoveries and improved recovery	5,914	4,536
Revisions of previous estimates	136	(864)
Converted to developed reserves	(407)	(513)
Reserves sold	0	0
Reserves purchased	0	0
End of year	14,709	9,066
Total Proved Reserves at the End of the Year	20,948	15,753
NGLs [Member]
Proved Developed Reserves:
Beginning of year	2,223	2,909
Extensions, discoveries and improved recovery	222
Revisions of previous estimates	(207)	(712)
Converted from undeveloped reserves	93	199
Reserves purchased	0	0
Production	(171)	(173)
End of year	2,160	2,223
Proved Undeveloped Reserves:
Beginning of year	3,707	2,877
Extensions, discoveries and improved recovery	1,629	1,541
Revisions of previous estimates	(921)	(512)
Converted to developed reserves	(93)	(199)
Reserves sold	0	0
Reserves purchased	0	0
End of year	4,322	3,707
Total Proved Reserves at the End of the Year	6,482	5,930
Gas [Member]
Proved Developed Reserves:
Beginning of year	31,628	27,833
Extensions, discoveries and improved recovery	424	402
Revisions of previous estimates	3,662	6,456
Converted from undeveloped reserves	735	1,207
Reserves purchased	0	0
Production	(4,182)	(4,270)
End of year	32,267	31,628
Proved Undeveloped Reserves:
Beginning of year	19,772	12,613
Extensions, discoveries and improved recovery	6,672	9,538
Revisions of previous estimates	622	(1,172)
Converted to developed reserves	(735)	(1,207)
Reserves sold	0	0
Reserves purchased	0	0
End of year	26,331	19,772
Total Proved Reserves at the End of the Year	58,598	51,400

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Proved developed reserves extensions discoveries and additions.

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Proved developed reserves net.

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Proved developed reserves production.

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Proved developed reserves purchases of minerals in place.

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Proved developed reserves sales of minerals in place.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447

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