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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2015 MBbls MMcf | Dec. 31, 2014 MBbls MMcf
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 6,239 | 6,687
Extensions, discoveries and improved recovery | 47 | 186
Revisions of previous estimates | (1,650) | (278)
Converted from undeveloped reserves | 677 | 407
Reserves sold | (53) | (4)
Reserves purchased | 39 |
Production | (720) | (759)
End of year | 4,579 | 6,239
Proved Undeveloped Reserves: |  |
Beginning of year | 14,709 | 9,066
Extensions, discoveries and improved recovery | 420 | 5,914
Revisions of previous estimates | (14,400) | 136
Converted to developed reserves | (677) | (407)
Reserves sold | 0 | 0
Reserves purchased | 0 | 0
End of year | 52 | 14,709
Total Proved Reserves at the End of the Year | 4,631 | 20,948
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 2,160 | 2,223
Extensions, discoveries and improved recovery | 85 | 222
Revisions of previous estimates | (560) | (207)
Converted from undeveloped reserves | 163 | 93
Reserves purchased | 12 |
Production | (187) | (171)
End of year | 1,673 | 2,160
Proved Undeveloped Reserves: |  |
Beginning of year | 4,322 | 3,707
Extensions, discoveries and improved recovery | 101 | 1,629
Revisions of previous estimates | (4,248) | (921)
Converted to developed reserves | (163) | (93)
Reserves sold | 0 | 0
Reserves purchased | 0 | 0
End of year | 12 | 4,322
Total Proved Reserves at the End of the Year | 1,685 | 6,482
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | MMcf | 32,267 | 31,628
Extensions, discoveries and improved recovery | MMcf | 2,067 | 424
Revisions of previous estimates | MMcf | (8,368) | 3,662
Converted from undeveloped reserves | MMcf | 944 | 735
Reserves sold | MMcf | (26) |
Reserves purchased | MMcf | 372 |
Production | MMcf | (3,981) | (4,182)
End of year | MMcf | 23,275 | 32,267
Proved Undeveloped Reserves: |  |
Beginning of year | MMcf | 26,331 | 19,772
Extensions, discoveries and improved recovery | MMcf | 701 | 6,672
Revisions of previous estimates | MMcf | (26,033) | 622
Converted to developed reserves | MMcf | (944) | (735)
Reserves sold | MMcf | 0 | 0
Reserves purchased | MMcf | 0 | 0
End of year | MMcf | 55 | 26,331
Total Proved Reserves at the End of the Year | MMcf | 23,330 | 58,598

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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=51678428&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=51678428&loc=d3e61797-109447 + Details
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