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Business Segment Information (Details Textual)	9 Months Ended
	Sep. 30, 2013 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	2.30%
GOGAS [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	92.00%
AMSO, LLC [Member]
Business Segment Information (Textual)
Ownership interest hold by subsidiary	50.00%
IEI [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	88.60%
Afek [Member]
Business Segment Information (Textual)
Company's investment, ownership percentage in subsidiary	89.00%

X

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- Definition

Deferred stock units granted represent Obligation percentage of equity.

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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