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Supplementary Information - Reserve Quantity Information (Detail) | 12 Months Ended
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Dec. 31, 2013 MBbls | Dec. 31, 2012 MBbls
Oil [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 7,178 | 6,418
Extensions, discoveries and improved recovery | 87 | 224
Revisions of previous estimates | (361) | 252
Converted from undeveloped reserves | 513 | 861
Reserves sold |  |
Reserves purchased |  | 168
Production | (730) | (745)
End of year | 6,687 | 7,178
Proved Undeveloped Reserves: |  |
Beginning of year | 5,907 | 2,435
Extensions, discoveries and improved recovery | 4,536 | 3,446
Revisions of previous estimates | 864 | 887
Converted to developed reserves | (513) | (861)
Reserves sold |  |
Reserves purchased |  |
End of year | 9,066 | 5,907
Total Proved Reserves at the End of the Year | 15,753 | 13,085
NGLs [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 2,909 |
Extensions, discoveries and improved recovery |  | 49
Revisions of previous estimates | (712) | 2,860
Converted from undeveloped reserves | 199 |
Reserves sold |  |
Production | (173) |
End of year | 2,223 | 2,909
Proved Undeveloped Reserves: |  |
Beginning of year | 2,877 |
Extensions, discoveries and improved recovery | 1,541 | 1,401
Revisions of previous estimates | (512) | 1,476
Converted to developed reserves | (199) |
Reserves sold |  |
Reserves purchased |  |
End of year | 3,707 | 2,877
Total Proved Reserves at the End of the Year | 5,930 | 5,786
Gas [Member] |  |
Proved Developed Reserves: |  |
Beginning of year | 27,833 | 43,631
Extensions, discoveries and improved recovery | 402 | 1,000
Revisions of previous estimates | 6,456 | (15,821)
Converted from undeveloped reserves | 1,207 | 3,527
Reserves sold |  |
Reserves purchased |  | 211
Production | (4,270) | (4,715)
End of year | 31,628 | 27,833
Proved Undeveloped Reserves: |  |
Beginning of year | 12,613 | 9,765
Extensions, discoveries and improved recovery | 9,538 | 6,158
Revisions of previous estimates | (1,172) | 217
Converted to developed reserves | (1,207) | (3,527)
Reserves sold |  |
Reserves purchased |  |
End of year | 19,772 | 12,613
Total Proved Reserves at the End of the Year | 51,400 | 40,446

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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 4 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447 Reference 2: 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=8451039&loc=d3e61884-109447 + Details
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