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Concentrations - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Unusual Risk or Uncertainty [Line Items]  
Maximum amount of credit risk exposure 31,929sgy_ConcentrationRiskMaximumCreditRiskExposureCustomer
GOM Deep Water, Conventional Shelf and Deep Gas Properties [Member]  
Unusual Risk or Uncertainty [Line Items]  
Production associated with properties 60.00%sgy_ProductionAssociatedWithProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= sgy_ConventionalGasMember
Estimated proved reserves derived 42.00%sgy_EstimatedReservesDerivedFromReservoirs
/ us-gaap_ConcentrationRiskByTypeAxis
= sgy_ConventionalGasMember
Appalachian Properties [Member]  
Unusual Risk or Uncertainty [Line Items]  
Production associated with properties 40.00%sgy_ProductionAssociatedWithProperties
/ us-gaap_ConcentrationRiskByTypeAxis
= sgy_AppalachianMember
Estimated proved reserves derived 58.00%sgy_EstimatedReservesDerivedFromReservoirs
/ us-gaap_ConcentrationRiskByTypeAxis
= sgy_AppalachianMember