Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v2.4.1.9
Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
segment
Dec. 31, 2013
Jun. 30, 2014
Segment Reporting Information [Line Items]          
Number of reportable segments     3us-gaap_NumberOfReportableSegments    
Loss from continuing operations $ (2,885)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (2,610)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (5,513)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (6,292)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments  
Total assets 68,449us-gaap_Assets   68,449us-gaap_Assets   81,435us-gaap_Assets
Nautilus Poplar, LLC (NP)          
Segment Reporting Information [Line Items]          
Revenue from oil production 1,265us-gaap_OilAndGasRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
1,633us-gaap_OilAndGasRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
2,855us-gaap_OilAndGasRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
3,767us-gaap_OilAndGasRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
 
Loss from continuing operations (657)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
(14)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
(544)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
(576)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
 
Total assets 31,152us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
  31,152us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
  27,299us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_NautilusPoplarLlcNpMember
Magellan Petroleum UK (MPUK)          
Segment Reporting Information [Line Items]          
Loss from continuing operations (149)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
(514)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
(581)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
(1,146)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
 
Total assets 3,835us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
  3,835us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
  4,486us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumUKMPUKMember
Magellan Petroleum Australia (MPA)          
Segment Reporting Information [Line Items]          
Loss from continuing operations (122)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
(757)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
 
Total assets 4,098us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
  4,098us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
  14,073us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= mpet_MagellanPetroleumAustraliaPtyLtdMember
Corporate          
Segment Reporting Information [Line Items]          
Loss from continuing operations (1,957)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
(2,267)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
(3,631)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
(4,751)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
 
Total assets 106,562us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
  106,562us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
  111,113us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Inter-segment Elimination          
Segment Reporting Information [Line Items]          
Loss from continuing operations 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
185us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
181us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
 
Total assets $ (77,198)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
  $ (77,198)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
  $ (75,536)us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember