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Oil and Gas Reserves Information (Unaudited) - Summary of Changes in Net Quantities of Crude Oil and Natural Gas Reserves (Detail)	12 Months Ended
	Dec. 31, 2016 MBbls MMcf	Dec. 31, 2015 MBbls MMcf	Dec. 31, 2014 MBbls MMcf	Dec. 31, 2013 MBbls MMcf
Oil (MBbls)
Proved Reserves:
Beginning of year | MBbls	9,229	20,854	21,976
Revisions of previous estimates | MBbls	(406)	(5,096)	(2,182)
Extensions and discoveries | MBbls	64	231	5,373
Sales of minerals in place | MBbls	(222)	(3,671)
Production | MBbls	(1,388)	(3,089)	(4,313)
End of year | MBbls	7,277	9,229	20,854
Proved Developed Reserves:
Proved Developed Reserves | MBbls	7,277	9,229	16,247	13,914
Natural Gas (MMcf)
Proved Reserves:
Beginning of year | MMcf	569,596	495,266	452,653
Revisions of previous estimates | MMcf	130,416	(41,437)	3,998
Extensions and discoveries | MMcf	285,076	168,539	78,383
Sales of minerals in place | MMcf	(58,942)	(5,096)
Production | MMcf	(53,678)	(47,676)	(39,768)
End of year | MMcf	872,468	569,596	495,266
Proved Developed Reserves:
Proved Developed Reserves | MMcf	321,527	311,130	324,598	344,278

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- Definition

Proved developed reserves.

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Proved developed reserves abstract.

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Proved reserves abstract.

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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

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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Production of proved reserves.

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

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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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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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