Variable Interest Entities (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	$ 4,596	$ 6,789
Total liabilities and noncontrolling interests	4,596	6,789
Cash and cash equivalents [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	434	1,047
Restricted cash [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	537	39
Trade accounts receivable [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	2,459	4,168
Prepaid expenses [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	364	485
Other current assets [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	353	519
Fixed assets, net [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets		38
Other assets [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total assets	449	493
Current liabilities [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total liabilities and noncontrolling interests	2,937	3,035
Due to IDT Energy [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total liabilities and noncontrolling interests	964	5,082
Noncontrolling Interests [Member]
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]
Total liabilities and noncontrolling interests	$ 695	$ (1,328)