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Business Segment Information (Details Textual)	6 Months Ended
	Jun. 30, 2014 Segment
Business Segment Information (Textual)
Number of Reportable Segments	2
GEIC [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	99.30%
IDT Energy [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	100.00%
Deferred stock units, stock obligation to related parties	1.40%
GOGAS [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	92.00%
AMSO, LLC [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	44.90%
IEI [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	87.90%
Afek [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	88.50%
Genie Mangolia [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	89.90%

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- Definition

Deferred stock units granted represent Obligation percentage of equity.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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