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Basis of Presentation (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Mar. 31, 2012
Jun. 30, 2014
IDT Energy [Member]
Jun. 30, 2014
Genie Oil and Gas [Member]
Jun. 30, 2014
Genie Energy International Corporation [Member]
Jun. 30, 2014
American Shale Oil L.L.C [Member]
Jun. 30, 2014
Israel Energy Initiatives [Member]
Jun. 30, 2014
Afek Oil and Gas Ltd. [Member]
Jun. 30, 2014
Genie Mangolia [Member]
Basis Of Presentation Textual [Abstract]                      
Company's investment, ownership percentage in subsidiary         100.00% 92.00% 99.30% 44.90% 87.90% 88.50% 89.90%
Deferred stock units granted to directors and employees represent obligation percentage of equity         1.40%            
Percentage of gas revenue generated in given period   49.00%   47.00%              
Percentage of electricity revenue generated in given period 31.00%   34.00%