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Subsequent Event (Details) (Subsequent event, Farm-in agreement, USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2013
Antrim Energy Inc. | Licensing Option 11/5
 
Subsequent events  
Participating interest acquired (as a percent) 75.00%
Europa Oil & Gas (Holdings) plc | Licensing Option 11/7
 
Subsequent events  
Participating interest acquired (as a percent) 85.00%
Percentage of costs of the first exploration well on each block to be funded 100.00%
Europa Oil & Gas (Holdings) plc | Licensing Option 11/7 | Maximum
 
Subsequent events  
Investment cap amount 90.0
Europa Oil & Gas (Holdings) plc | Licensing Option 11/8
 
Subsequent events  
Participating interest acquired (as a percent) 85.00%
Percentage of costs of the first exploration well on each block to be funded 100.00%
Europa Oil & Gas (Holdings) plc | Licensing Option 11/8 | Maximum
 
Subsequent events  
Investment cap amount 110.0