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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