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Supplemental Information on Oil and Natural Gas Producing Activities - Summary of Changes in Estimated Oil and Natural Gas Reserves - Noncontrolling Interests (Unaudited) (Additional Information) (Details) Mcf in Thousands	Dec. 31, 2015 MBbls Mcf	Dec. 31, 2014 MBbls Mcf	Dec. 31, 2013 MBbls Mcf	Dec. 31, 2012 MBbls Mcf
Oil Reserves
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas)	77,911	126,031	142,641	262,045
Natural Gas Liquids
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas)	61,075	91,786	59,052	67,994
Natural Gas Reserves
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf	1,113,840	1,788,233	1,390,429	1,415,042
Non-controlling Interest | Oil Reserves
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas)	7,004	11,027	13,569
Non-controlling Interest | Natural Gas Liquids
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas)	3,694	4,761	4,737
Non-controlling Interest | Natural Gas Reserves
Reserve Quantities [Line Items]
Proved reserves (in MBbls for Oil and NGLs/MMcf for Natural Gas) | Mcf	50,508	70,833	69,693

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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=51678428&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

+ Details

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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

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