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Changes in Asset Retirement Obligations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Asset retirement obligations, December 31, 2011	$ 908,790	$ 883,066
Liabilities incurred during the period	347,018	297,800
Liabilities settled during the year	(1,427)	(359,513)
Accretion	93,973	87,437
Asset retirement obligations, December 31, 2012	$ 1,336,151	$ 908,790

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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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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Noncurrent portion of 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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