Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013 segment	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of Reportable Segments	3
Revenues	$ 2,355	$ 1,660
Revenue, Net	2,355	1,660
Consolidated net income (loss)	(4,835)	(5,310)
Nautilus Poplar, LLC (NP)
Segment Reporting Information [Line Items]
Revenues	2,134	1,460
Consolidated net income (loss)	(562)	(272)
Magellan Petroleum Australia Limited (MPAL)
Segment Reporting Information [Line Items]
Revenues	221	200
Consolidated net income (loss)	(1,091)	(437)
Magellan Petroleum UK (MPUK)
Segment Reporting Information [Line Items]
Consolidated net income (loss)	(632)	(1,387)
Corporate
Segment Reporting Information [Line Items]
Consolidated net income (loss)	(2,546)	(3,043)
Inter-segment Elimination
Segment Reporting Information [Line Items]
Consolidated net income (loss)	$ (4)	$ (171)