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Commitments and Contingencies (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Oct. 31, 2013
Dec. 31, 2012
Commitments and Contingencies (Textual)      
Trade accounts payable $ 17,565,000   $ 20,641,000
Purchase and other commitments 1,300,000 800,000  
Amount accrued for income tax audit 900,000    
Description of termination date of agreement between BP Energy and IDT Energy The agreement's termination date is June 30, 2014, which automatically renews for an additional year unless either party provides written notice to the other party at least six months prior to June 30, 2014 that it will not renew the agreement.    
Minimum [Member]
      
Commitments and Contingencies (Textual)      
Tax liability by Company 0    
Maximum [Member]
      
Commitments and Contingencies (Textual)      
Tax liability by Company 300,000    
JPMorgan [Member]
      
Commitments and Contingencies (Textual)      
Line of credit facility, amount outstanding 2,000,000    
BP [Member]
      
Commitments and Contingencies (Textual)      
Restricted cash pledged as collateral 400,000    
Trade accounts receivable pledged as collateral 37,700,000    
Trade accounts payable 13,800,000    
IDT Energy [Member]
      
Commitments and Contingencies (Textual)      
Aggregate performance bonds outstanding $ 3,000,000