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Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Summary of the change in the balance of the Company's asset measured at fair value on a recurring basis using significant unobservable inputs (Level 3) |
Balance, December 31, 2013 | $ 62
Total losses (realized or unrealized) included in earnings in "Direct cost of revenues" | (62)
Balance, June 30, 2014 |
The amount of total gains or losses for the period included in earnings in "Direct cost of revenues" attributable to the change in unrealized gains or losses relating to assets held at the end of the period |

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- Definition Amount of gains losses for period included in earnings direct cost of revenues to change in unrealized gains or losses relating to assets held at end of period. + References No definition available. + Details
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Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value assets measured on recurring basis gain loss included in earnings in direct cost of revenues. + References No definition available. + Details
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Namespace Prefix: | gne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant