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Estimated Quantities of Proved Reserves (Detail)	12 Months Ended
	Dec. 31, 2012 bbl	Dec. 31, 2011 bbl
Proved reserves:
Beginning	2,714,150	2,320,150
Revisions of previous estimates	(193,059)	(130,908)
Purchase of minerals in place	0	700,190
Extension and discoveries	502,751	316,049
Sale of minerals in place	0	(221,365)
Sales of Rantoul Partners interest		(198,187)
Production	(96,842)	(71,729)
Ending	2,927,000	2,714,150

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Sale of rantoul Partners interest.

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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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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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