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Commitments and Contingencies (Details) (USD $) |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 BP [Member] | Jun. 30, 2014 IDT Energy [Member]
Commitments and Contingencies (Textual) |  |  |  |
Restricted cash pledged as collateral |  |  | $ 300,000 |
Trade accounts receivable pledged as collateral |  |  | 27,100,000 |
Trade accounts payable | 14,298,000 | 25,302,000 | 11,300,000 |
Aggregate performance bonds outstanding |  |  |  | 3,800,000
Line of credit facility, amount outstanding | 7,600,000 | 5,700,000 |  |
Purchase and other commitments | 7,200,000 |  |  |
Amount accrued for income tax audit | 200,000 |  |  |
Purchase of renewable energy credit |  |  |  | $ 15,900,000

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- Definition Amount accrued for income tax audit. + References No definition available. + Details
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- Details
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- Definition Performance bond outstanding. + References No definition available. + Details
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Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Purchase of renewable energy credit. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Restricted cash pledged as collateral. + References No definition available. + Details
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Balance Type: | credit
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- Definition Trade accounts receivable pledged as collateral. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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