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Derivative Contracts (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Derivative [Line Items]  
Fair Value $ (1,868,043)
Crude Oil Swap | Derivative Instrument 1
 
Derivative [Line Items]  
Monthly Volumes Bbls 1,711
Price per Bbl 76.74
Fair Value (871,272)
Crude Oil Swap | Derivative Instrument 2
 
Derivative [Line Items]  
Monthly Volumes Bbls 2,589
Price per Bbl 83.70
Fair Value (670,495)
Crude Oil Swap | Derivative Instrument 4
 
Derivative [Line Items]  
Monthly Volumes Bbls 1,369
Price per Bbl 90.25
Fair Value (99,975)
Crude Oil Swap | Derivative Instrument 5
 
Derivative [Line Items]  
Monthly Volumes Bbls 1,300
Price per Bbl 97.10
Fair Value (22,880)
Crude Oil Swap | Derivative Instrument 6
 
Derivative [Line Items]  
Monthly Volumes Bbls 1,900
Price per Bbl 96.00
Fair Value (8,170)
Crude Oil Swap | Derivative Instrument 7
 
Derivative [Line Items]  
Monthly Volumes Bbls 5,800
Price per Bbl 88.55
Fair Value (40,948)
Crude Oil Swap | Derivative Instrument 8
 
Derivative [Line Items]  
Monthly Volumes Bbls 3,000
Price per Bbl 95.15
Fair Value (113,850)
Crude Oil Swap | Minimum | Derivative Instrument 1
 
Derivative [Line Items]  
Term 2013-10
Crude Oil Swap | Minimum | Derivative Instrument 2
 
Derivative [Line Items]  
Term 2013-10
Crude Oil Swap | Minimum | Derivative Instrument 4
 
Derivative [Line Items]  
Term 2014-01
Crude Oil Swap | Minimum | Derivative Instrument 5
 
Derivative [Line Items]  
Term 2013-10
Crude Oil Swap | Minimum | Derivative Instrument 6
 
Derivative [Line Items]  
Term 2014-01
Crude Oil Swap | Minimum | Derivative Instrument 7
 
Derivative [Line Items]  
Term 2015-01
Crude Oil Swap | Minimum | Derivative Instrument 8
 
Derivative [Line Items]  
Term 2013-10
Crude Oil Swap | Maximum | Derivative Instrument 1
 
Derivative [Line Items]  
Term 2015-12
Crude Oil Swap | Maximum | Derivative Instrument 2
 
Derivative [Line Items]  
Term 2015-12
Crude Oil Swap | Maximum | Derivative Instrument 4
 
Derivative [Line Items]  
Term 2014-12
Crude Oil Swap | Maximum | Derivative Instrument 5
 
Derivative [Line Items]  
Term 2013-12
Crude Oil Swap | Maximum | Derivative Instrument 6
 
Derivative [Line Items]  
Term 2014-12
Crude Oil Swap | Maximum | Derivative Instrument 7
 
Derivative [Line Items]  
Term 2015-12
Crude Oil Swap | Maximum | Derivative Instrument 8
 
Derivative [Line Items]  
Term 2014-12
Crude Oil Price Collar | Derivative Instrument 3
 
Derivative [Line Items]  
Monthly Volumes Bbls 1,587
Fair Value $ (40,453)
Crude Oil Price Collar | Minimum | Derivative Instrument 3
 
Derivative [Line Items]  
Term 2013-10
Price per Bbl 90.00
Crude Oil Price Collar | Maximum | Derivative Instrument 3
 
Derivative [Line Items]  
Term 2013-12
Price per Bbl 94.50