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Document and Entity Information
9 Months Ended
Sep. 30, 2013
Nov. 07, 2013
Class A common stock
Nov. 07, 2013
Class B common stock
Entity Registrant Name Genie Energy Ltd.    
Entity Central Index Key 0001528356    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Type 10-Q    
Document Period End Date Sep. 30, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q3    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   1,574,326 19,625,948