Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Effect of Fourth Quarter Events [Line Items]                    
Impairment of proved oil and gas properties                 $ 17,353 $ 0
Gross unrealized losses $ (14,917)       $ (7,404)       (14,917) (7,404)
Selected Quarterly Financial Information [Abstract]                    
Revenue from oil production (1) 916 $ 688 $ 1,265 $ 1,590 1,927 $ 1,907 $ 1,633 $ 2,134 4,459 7,601
Total operating expenses (2) 21,459 4,863 4,153 4,280 5,092 4,927 4,193 5,737 34,755 19,949
Loss from continuing operations attributable to Magellan Petroleum Corporation $ (35,543) $ (2,115) $ (2,715) $ (2,627)         (43,000) 15,509
Loss from continuing operations         $ (679) $ (3,072) $ (2,610) $ (3,681) $ (43,411) $ (10,042)
Net loss per basic common share from continuing operations (usd per share) $ (6.29) $ (0.45) $ (0.55) $ (0.54) $ (0.20) $ (0.62) $ (0.53) $ (0.72) $ (7.83) $ (2.07)
Net loss per diluted common share outstanding from continuing operations (usd per share) $ (6.29) $ (0.45) $ (0.55) $ (0.54) $ (0.20) $ (0.62) $ (0.53) $ (0.72) $ (7.83) $ (2.07)
Net (loss) income attributable to common stockholders $ (35,986) $ (2,552) $ (3,145) $ (3,057) $ (493) $ 24,089 $ (4,533) $ (5,250) $ (44,740) $ 13,813
Net (loss) income per basic common share outstanding attributable to common stockholders (usd per share) $ (6.29) $ (0.45) $ (0.55) $ (0.54) $ (0.08) $ 4.25 $ (0.80) $ (0.93) $ (7.83) $ 2.44
Net (loss) income per diluted common share outstanding attributable to common stockholders (usd per share) $ (6.29) $ (0.45) $ (0.55) $ (0.54) $ (0.08) $ 4.25 $ (0.80) $ (0.93) $ (7.83) $ 2.44
Amadeus Basin                    
Effect of Fourth Quarter Events [Line Items]                    
Gain on sale of assets           $ 30,000        
Nautilus Poplar, LLC (NP)                    
Effect of Fourth Quarter Events [Line Items]                    
Other Income                 $ 1,900  
Recurring | Contingent consideration payable | Level 3                    
Effect of Fourth Quarter Events [Line Items]                    
Revision to estimate                 $ (1,888) $ (2,403)