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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2016 MMcf MBbls | Dec. 31, 2015 MMcf MBbls
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 4,579 | 6,239
Extensions, discoveries and improved recovery | 577 | 47
Revisions of previous estimates | (1,425) | (1,650)
Converted from undeveloped reserves | 46 | 677
Reserves sold |  | (53)
Reserves purchased |  | 39
Production | (670) | (720)
End of year | 3,107 | 4,579
Proved Undeveloped Reserves: |  |
Beginning of year | 52 | 14,709
Extensions, discoveries and improved recovery | 635 | 420
Revisions of previous estimates | 2 | (14,400)
Converted to developed reserves | (46) | (677)
End of year | 643 | 52
Total Proved Reserves at the End of the Year | 3,750 | 4,631
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 1,673 | 2,160
Extensions, discoveries and improved recovery | 176 | 85
Revisions of previous estimates | (527) | (560)
Converted from undeveloped reserves | 14 | 163
Reserves sold | (1) |
Reserves purchased |  | 12
Production | (70) | (187)
End of year | 1,265 | 1,673
Proved Undeveloped Reserves: |  |
Beginning of year | 12 | 4,322
Extensions, discoveries and improved recovery | 157 | 101
Revisions of previous estimates | 4 | (4,248)
Converted to developed reserves | (14) | (163)
End of year | 159 | 12
Total Proved Reserves at the End of the Year | 1,424 | 1,685
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | MMcf | 23,275 | 32,267
Extensions, discoveries and improved recovery | MMcf | 1,136 | 2,067
Revisions of previous estimates | MMcf | (7,342) | (8,368)
Converted from undeveloped reserves | MMcf | 65 | 944
Reserves sold | MMcf | (7) | (26)
Reserves purchased | MMcf |  | 372
Production | MMcf | (4,126) | (3,981)
End of year | MMcf | 13,001 | 23,275
Proved Undeveloped Reserves: |  |
Beginning of year | MMcf | 55 | 26,331
Extensions, discoveries and improved recovery | MMcf | 1,994 | 701
Revisions of previous estimates | MMcf | 19 | (26,033)
Converted to developed reserves | MMcf | (65) | (944)
End of year | MMcf | 2,003 | 55
Total Proved Reserves at the End of the Year | MMcf | 15,004 | 23,330

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61884-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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