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Business Segment Information (Details Textual) | 9 Months Ended
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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%

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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. + Details
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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. + Details
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