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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities (Unaudited) - Changes in Proved Undeveloped Reserves (Detail) | 12 Months Ended
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Dec. 31, 2015 MMcfe
Extractive Industries [Abstract] |  |
Beginning proved undeveloped reserves at December 31, 2014 | 4,960,468 |
Undeveloped reserves transferred to developed | (762,936) |
Revisions | (441,874) | [1]
Purchases/(sales) | (201,809) |
Extension and discoveries | 915,739 |
Ending proved undeveloped reserves at December 31, 2015 | 4,469,588 |
[1] | Includes 1.2 Tcfe of proved undeveloped reserves dropped due to the five year rule which can be included in our future proved reserves as these locations are added back to our five-year development plan.

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- Definition Volumetric amount of increase (decrease) as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References No definition available. + Details
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- Definition Proved undeveloped reserves purchases and sales. + References No definition available. + Details
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- Definition Amount of increase (decrease) in proved undeveloped reserves as a result of revisions of estimated quantity. + References No definition available. + Details
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- Definition Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that transferred to proved developed reserves by the end of the period. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Energy measure of proved undeveloped reserves of 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. + References No definition available. + Details
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