Changes in Proved Reserves (Detail)	12 Months Ended
Dec. 31, 2012 Boe bu	Dec. 31, 2011 Boe bu
Reserve Quantities [Line Items]
Sale of oil and gas reserves in place	(7,950)
Revisions in previous estimates	(44,850)
Beginning balance	512,902
Purchase of oil and gas reserves in place		529,305
Production	(40,223)	(16,403)
Ending balance	419,879	512,902
Proved developed	343,471	390,784
Proved undeveloped	76,408	122,118
Oil (Bbl)
Reserve Quantities [Line Items]
Beginning balance	375,018
Sale of oil and gas reserves in place	(7,950)
Purchase of oil and gas reserves in place		385,008
Revisions in previous estimates	(10,040)
Production	(25,356)	(9,990)
Ending balance	331,672	375,018
Proved developed	255,264	290,038
Proved undeveloped	76,408	84,980
Gas (Mcf)
Reserve Quantities [Line Items]
Beginning balance	827,301
Purchase of oil and gas reserves in place		865,778
Revisions in previous estimates	(208,859)
Production	(89,203)	(38,477)
Ending balance	529,239	827,301
Proved developed	529,239	604,476
Proved undeveloped		222,825

Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions, Boe

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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Production of proved reserves.

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Sales of minerals in place.

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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 do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).

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