Proved Developed And Undeveloped Reserve Revisions Of Previous Estimates Increase Decrease One

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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).

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

Reference 2: 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.(a)(2))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

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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/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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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

Reference 1: 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=68064819&loc=d3e61884-109447

Reference 2: 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=68064819&loc=d3e61797-109447

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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

No definition available.

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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, 2016 MBoe MMcf MBbls	Dec. 31, 2015 MBoe MMcf MBbls	Dec. 31, 2014 MBoe MMcf MBbls	Dec. 31, 2013 MBoe MMcf
Reserve Quantities [Line Items]
Proved Developed Reserves (MBOE) \| MBoe	518,646	525,188	502,479
Proved Undeveloped Reserve (MBOE) \| MBoe	756,218	700,623	848,612
Proved Developed and Undeveloped Reserve, Net (MBOE) \| MBoe	1,274,864	1,225,811	1,351,091	1,084,125
Crude Oil [Member]
Reserve Quantities [Line Items]
Proved Developed Reserves (Volume) \| MBbls	290,210	326,798	342,137
Proved Undeveloped Reserve (Volume) \| MBbls	353,018	373,716	524,223
Proved Developed and Undeveloped Reserves, Net \| MBbls	643,228	700,514	866,360
Proved Undeveloped Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	70
Proved Undeveloped Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	51
Proved Undeveloped Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MMcf	118
Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MMcf	(63,057)	(302,143)	(244,783)
Proved Developed Reserves (Volume) \| MMcf	1,370,620	1,190,343	962,051
Proved Undeveloped Reserve (Volume) \| MMcf	2,419,198	1,961,443	1,946,335
Proved Developed and Undeveloped Reserves, Net \| MMcf	3,789,818	3,151,786	2,908,386	2,078,020
Proved Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	37
Other [Domain] \| Proved Reserves [Domain]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBoe	3
Other [Domain] \| Proved Reserves [Domain] \| Crude Oil [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MBbls	7
Other [Domain] \| Proved Reserves [Domain] \| Natural Gas [Member]
Reserve Quantities [Line Items]
Revisions of previous estimates \| MMcf	61