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Reconciliation of Asset Retirement Obligations (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Sep. 30, 2013
Asset Retirement Obligations [Line Items]        
Beginning balance $ 682,203      
Liabilities incurred         
Accretion expense 16,538 16,294    
Revisions to estimate         
Ending balance 698,741      
Less current asset retirement obligations (161,423)   (159,782)  
Long-term asset retirement obligations $ 537,318   $ 522,421 $ 31,000