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Reconciliation of Asset Retirement Obligations (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Feb. 29, 2012
Asset Retirement Obligations [Line Items]        
Balance, December 31, 2012 $ 647,268      
Liabilities incurred         
Accretion expense 50,034 27,788    
Revisions to estimate         
Balance, September 30, 2013 697,302      
Less current asset retirement obligations (112,804)   (78,140)  
Long-term asset retirement obligations $ 584,498   $ 569,128 $ 16,000