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Reconciliation of Asset Retirement Obligations (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Feb. 29, 2012
Asset Retirement Obligations [Line Items]
Balance, December 31, 2012	$ 647,268
Liabilities incurred
Accretion expense	16,294	2,066
Revisions to estimate
Balance, March 31, 2013	663,562
Less current asset retirement obligations	(79,380)		(78,140)
Long-term asset retirement obligations	$ 584,182		$ 569,128	$ 16,000

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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