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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2018 MBbls MMcf | Dec. 31, 2017 MBbls MMcf
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 5,333 | 3,107
Extensions, discoveries and improved recovery | 1,389 | 2,263
Revisions of previous estimates | 192 | 496
Converted from undeveloped reserves | 605 | 383
Reserves sold | (3) | (2)
Reserve purchased | 75 | 90
Production | (1,187) | (1,004)
End of year | 6,404 | 5,333
Proved Undeveloped Reserves: |  |
Beginning of year | 505 | 643
Extensions, discoveries and improved recovery | 212 | 298
Revisions of previous estimates | (102) | (53)
Converted to developed reserves | (605) | (383)
End of year | 10 | 505
Total Proved Reserves at the End of the Year | 6,414 | 5,838
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 1,704 | 1,265
Extensions, discoveries and improved recovery | 511 | 488
Revisions of previous estimates | 662 | 89
Converted from undeveloped reserves | 258 | 103
Reserve purchased | 35 | 41
Production | (463) | (282)
End of year | 2,707 | 1,704
Proved Undeveloped Reserves: |  |
Beginning of year | 156 | 159
Extensions, discoveries and improved recovery | 216 | 118
Revisions of previous estimates | (102) | (18)
Converted to developed reserves | (258) | (103)
End of year | 12 | 156
Total Proved Reserves at the End of the Year | 2,719 | 1,860
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | MMcf | 17,143 | 13,001
Extensions, discoveries and improved recovery | MMcf | 2,832 | 3,253
Revisions of previous estimates | MMcf | 4,144 | 3,846
Converted from undeveloped reserves | MMcf | 870 | 476
Reserves sold | MMcf | (368) | (13)
Reserve purchased | MMcf | 179 | 220
Production | MMcf | (3,735) | (3,640)
End of year | MMcf | 21,065 | 17,143
Proved Undeveloped Reserves: |  |
Beginning of year | MMcf | 709 | 2,003
Extensions, discoveries and improved recovery | MMcf | 446 | 335
Revisions of previous estimates | MMcf | (161) | (1,153)
Converted to developed reserves | MMcf | (870) | (476)
End of year | MMcf | 124 | 709
Total Proved Reserves at the End of the Year | MMcf | 21,189 | 17,852

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- Definition 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/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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