Reconciliation of Asset Retirement Obligations (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Feb. 29, 2012
Asset Retirement Obligations [Line Items]
Balance, beginning of year	$ 653,240
Liabilities incurred upon acquisition of properties		639,176
Liabilities assumed by buyer of properties	(16,411)
Liabilities settled	(81,007)
Accretion expense	35,621	14,064
Revisions of prior estimates	55,825
Balance, end of year	647,268	653,240
Less current asset retirement obligations	(78,140)	(15,398)
Long-term asset retirement obligations	$ 569,128	$ 637,842	$ 16,000

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Liabilities assumed by buyer of properties.

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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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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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Current 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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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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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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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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