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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

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