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Investment in Oil and Gas Properties - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Oil and Gas In Process Activities [Line Items]      
Write-down of oil and gas properties $ 491,412,000us-gaap_ImpairmentOfOilAndGasProperties     
Average 12-month oil prices net of differentials 78.99sgy_AverageTwelveMonthOilPricesNetOfDifferentials    
Average 12-month gas prices net of differentials 2.96sgy_AverageTwelveMonthGasPricesNetOfDifferentials    
Decrease in written down value of oil and gas properties 28,700,000sgy_DecreaseInImpairmentOfOilAndGasProperties    
Capital expenditures related to oil and gas property investments 602,467,000us-gaap_CapitalizedCostsUnprovedProperties   567,365,000us-gaap_CapitalizedCostsUnprovedProperties
Canada [Member]      
Oil and Gas In Process Activities [Line Items]      
Capital expenditures related to oil and gas property investments 44,200,000us-gaap_CapitalizedCostsUnprovedProperties
/ us-gaap_StatementGeographicalAxis
= country_CA
  36,600,000us-gaap_CapitalizedCostsUnprovedProperties
/ us-gaap_StatementGeographicalAxis
= country_CA
Oil And Gas [Member]      
Oil and Gas In Process Activities [Line Items]      
Write-down of oil and gas properties $ 491,400,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sgy_OilAndGasMember
   
Natural Gas Liquids (MBbls) [Member]      
Oil and Gas In Process Activities [Line Items]      
Average 12-month gas prices net of differentials 28.82sgy_AverageTwelveMonthGasPricesNetOfDifferentials
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= sgy_NaturalGasLiquidsMember