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Marketable Securities - Summary of Available-For-Sale Securities Owned by Company (Detail) (USD $)
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Estimated fair value $ 406,134us-gaap_AvailableForSaleSecurities
Common Stock [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Investment at cost 238,504us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Unrealized gains 167,630egas_AvailableForSaleEquitySecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Unrealized losses 0egas_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Estimated fair value $ 406,134us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember