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Derivative Instruments (Details) | 12 Months Ended
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Dec. 31, 2015
Electricity [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | January 2016
Volume | 248,000 MWh
Electricity 1 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | February 2016
Volume | 772,800 MWh
Electricity 2 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | March 2016
Volume | 82,800 MWh
Electricity 3 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | April 2016
Volume | 16,800 MWh
Electricity 4 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | July 2016
Volume | 160,000 MWh
Electricity 5 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | August 2016
Volume | 184,000 MWh
Electricity 6 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Electricity
Settlement Dates | September 2016
Volume | 33,600 MWh
Natural Gas [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Natural gas
Settlement Dates | February 2016
Volume | 852,500 Dth
Natural Gas 1 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Natural gas
Settlement Dates | April 2016
Volume | 200,000 Dth
Natural Gas 2 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Natural gas
Settlement Dates | July 2016
Volume | 1,110,000 Dth
Natural Gas 3 [Member] |
Summarized volume of IDT Energy's outstanding |
Commodity | Natural gas
Settlement Dates | August 2016
Volume | 800,000 Dth

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