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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Summary of related party transactions |  |  |  |
Amount IDT charged the Company | $ 224 | $ 313 | $ 920 | $ 1,203
IDT [Member] |  |  |  |
Summary of related party transactions |  |  |  |
Amount charged | 73 | 116 | 302 | 346
Rafael [Member] |  |  |  |
Summary of related party transactions |  |  |  |
Amount charged | $ 53 |  | $ 107 |

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- Definition Reduction of selling, general and administrative expenses resulting from transactions with related party. + References No definition available. + Details
Name: | gne_RelatedPartyTransactionReductionOfSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedPartyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gne_IdtCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=gne_RafaelHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |