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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2017 MMcf MBbls | Dec. 31, 2016 MMcf MBbls
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 3,107 | 4,579
Extensions, discoveries and improved recovery | 2,263 | 577
Revisions of previous estimates | 496 | (1,425)
Converted from undeveloped reserves | 383 | 46
Reserves sold | (2) |
Reserve purchased | 90 |
Production | (1,004) | (670)
End of year | 5,333 | 3,107
Proved Undeveloped Reserves: |  |
Beginning of year | 643 | 52
Extensions, discoveries and improved recovery | 298 | 635
Revisions of previous estimates | (53) | 2
Converted to developed reserves | (383) | (46)
End of year | 505 | 643
Total Proved Reserves at the End of the Year | 5,838 | 3,750
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 1,265 | 1,673
Extensions, discoveries and improved recovery | 488 | 176
Revisions of previous estimates | 89 | (527)
Converted from undeveloped reserves | 103 | 14
Reserves sold |  | (1)
Reserve purchased | 41 |
Production | (282) | (70)
End of year | 1,704 | 1,265
Proved Undeveloped Reserves: |  |
Beginning of year | 159 | 12
Extensions, discoveries and improved recovery | 118 | 157
Revisions of previous estimates | (18) | 4
Converted to developed reserves | (103) | (14)
End of year | 156 | 159
Total Proved Reserves at the End of the Year | 1,860 | 1,424
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | MMcf | 13,001 | 23,275
Extensions, discoveries and improved recovery | MMcf | 3,253 | 1,136
Revisions of previous estimates | MMcf | 3,846 | (7,342)
Converted from undeveloped reserves | MMcf | 476 | 65
Reserves sold | MMcf | (13) | (7)
Reserve purchased | MMcf | 220 |
Production | MMcf | (3,640) | (4,126)
End of year | MMcf | 17,143 | 13,001
Proved Undeveloped Reserves: |  |
Beginning of year | MMcf | 2,003 | 55
Extensions, discoveries and improved recovery | MMcf | 335 | 1,994
Revisions of previous estimates | MMcf | (1,153) | 19
Converted to developed reserves | MMcf | (476) | (65)
End of year | MMcf | 709 | 2,003
Total Proved Reserves at the End of the Year | MMcf | 17,852 | 15,004

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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=82851474&loc=d3e511914-122862 + Details
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