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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 |
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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 abstract. + References No definition available. + Details
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- Definition Proved reserves abstract. + References No definition available. + Details
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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 + Details
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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 + Details
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- Definition 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 + Details
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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=68064819&loc=d3e61831-109447 + Details
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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=68064819&loc=d3e61831-109447 + Details
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