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v2.4.0.8

Related Party Transaction (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Summary of related party transactions |  |  |  |
Amount IDT charged the Company | $ 913 | $ 974 | $ 2,363 | $ 2,517
Amount the Company charged IDT | $ 82 | $ 20 | $ 189 | $ 66

X
- Definition Amount that company charged to related party pursuant to transition services agreement. + References No definition available. + Details
Name: | gne_AmountCompanyChargedToRelatedPartyPursuantToTransitionServicesAgreement
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | gne_SummaryOfRelatedPartyTransactionAbstract
Namespace Prefix: | gne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration