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Summarized Quarterly Financial Information - Unaudited - Results of Operations by Quarter (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]            
Write-down of oil and gas properties, before tax $ 304,062us-gaap_ImpairmentOfOilAndGasProperties $ 47,130us-gaap_ImpairmentOfOilAndGasProperties   $ 351,192us-gaap_ImpairmentOfOilAndGasProperties    
Write-down of oil and gas properties, after tax 194,600us-gaap_AssetImpairmentCharges 30,163us-gaap_AssetImpairmentCharges        
Franchise tax settlement     12,590us-gaap_GainLossRelatedToLitigationSettlement   12,590us-gaap_GainLossRelatedToLitigationSettlement  
Franchise tax settlement, after tax     8,058sgy_GainLossRelatedToLitigationSettlementNetOfTax      
Loss on early extinguishment of debt, before tax     27,279us-gaap_GainsLossesOnExtinguishmentOfDebt   27,279us-gaap_GainsLossesOnExtinguishmentOfDebt 1,972us-gaap_GainsLossesOnExtinguishmentOfDebt
Loss on early extinguishment of debt, after tax     $ 17,459us-gaap_ExtinguishmentOfDebtGainLossNetOfTax