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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Summary of related party transactions |  |  |  |
Amount IDT charged the Company | $ 639 | $ 705 | $ 1,418 | $ 1,450
Amount the Company charged IDT | $ 136 | $ 49 | $ 275 | $ 107

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

X
- 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