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Guarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income (loss) $ (189,543)us-gaap_NetIncomeLoss $ 117,634us-gaap_NetIncomeLoss $ 149,426us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 340,006us-gaap_DepreciationDepletionAndAmortization 350,574us-gaap_DepreciationDepletionAndAmortization 344,365us-gaap_DepreciationDepletionAndAmortization
Write-down of oil and gas properties 351,192us-gaap_ImpairmentOfOilAndGasProperties    
Accretion expense 28,411us-gaap_AssetRetirementObligationAccretionExpense 33,575us-gaap_AssetRetirementObligationAccretionExpense 33,331us-gaap_AssetRetirementObligationAccretionExpense
Deferred income tax (benefit) provision (102,177)us-gaap_DeferredIncomeTaxExpenseBenefit 79,629us-gaap_DeferredIncomeTaxExpenseBenefit 69,575us-gaap_DeferredIncomeTaxExpenseBenefit
Settlement of asset retirement obligations (56,409)us-gaap_AssetRetirementObligationCashPaidToSettle (83,854)us-gaap_AssetRetirementObligationCashPaidToSettle (65,567)us-gaap_AssetRetirementObligationCashPaidToSettle
Non-cash stock compensation expense 11,325us-gaap_ShareBasedCompensation 10,347us-gaap_ShareBasedCompensation 8,699us-gaap_ShareBasedCompensation
Excess tax benefits   (156)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (949)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Non-cash derivative expense (18,028)us-gaap_UnrealizedGainLossOnDerivatives 2,239us-gaap_UnrealizedGainLossOnDerivatives (509)us-gaap_UnrealizedGainLossOnDerivatives
Loss on early extinguishment of debt   27,279us-gaap_GainsLossesOnExtinguishmentOfDebt 1,972us-gaap_GainsLossesOnExtinguishmentOfDebt
Non-cash interest expense 16,661us-gaap_OtherNoncashExpense 16,219us-gaap_OtherNoncashExpense 13,085us-gaap_OtherNoncashExpense
Change in current income taxes 158us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 2,767us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 10,618us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
(Increase) decrease in accounts receivable 51,611us-gaap_IncreaseDecreaseInAccountsReceivable (4,683)us-gaap_IncreaseDecreaseInAccountsReceivable (55,871)us-gaap_IncreaseDecreaseInAccountsReceivable
(Increase) decrease in other current assets (6,244)us-gaap_IncreaseDecreaseInOtherOperatingAssets 1,752us-gaap_IncreaseDecreaseInOtherOperatingAssets (2,836)us-gaap_IncreaseDecreaseInOtherOperatingAssets
(Increase) decrease in inventory   583us-gaap_IncreaseDecreaseInInventories 436us-gaap_IncreaseDecreaseInInventories
Decrease in accounts payable (3,419)us-gaap_IncreaseDecreaseInAccountsPayable 402us-gaap_IncreaseDecreaseInAccountsPayable 5,101us-gaap_IncreaseDecreaseInAccountsPayable
Decrease in other current assets (19,152)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 42,451us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (10,426)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Other (3,251)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (2,553)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 9,299us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities     509,749us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities 401,141us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 594,205us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 509,749us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Investment in oil and gas properties (927,247)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties (663,299)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties (555,855)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
Proceeds from sale of oil and gas properties, net of expenses 242,914us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 48,821us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 403us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Sale of fixed assets     134us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment
Investment in fixed and other assets (10,182)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment (6,816)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment (13,370)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
Change in restricted funds (178,072)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (1,742)us-gaap_PaymentsForProceedsFromOtherInvestingActivities  
Net cash used in investing activities (872,587)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (623,036)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (568,688)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Proceeds from bank borrowings     25,000us-gaap_ProceedsFromLongTermLinesOfCredit
Proceeds from issuance of common stock 225,999us-gaap_ProceedsFromIssuanceOfCommonStock    
Repayment of bank borrowings     (70,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
Proceeds from issuance of senior convertible notes     300,000us-gaap_ProceedsFromConvertibleDebt
Deferred financing costs of senior convertible notes     (8,855)sgy_PaymentForFinancingCostsOfSeniorConvertibleNotes
Proceeds from sold warrants     40,170us-gaap_ProceedsFromIssuanceOfWarrants
Payments for purchased call options     (70,830)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Proceeds from issuance of senior notes   489,250us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 300,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Deferred financing costs (3,371)us-gaap_PaymentsOfDebtIssuanceCosts (9,065)us-gaap_PaymentsOfDebtIssuanceCosts (11,966)us-gaap_PaymentsOfDebtIssuanceCosts
Redemption of senior subordinated notes     (200,681)us-gaap_RepaymentsOfSubordinatedDebt
Redemption of senior notes   (396,014)us-gaap_RepaymentsOfSeniorDebt  
Excess tax benefits   156us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 949us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net payments for share-based compensation (7,182)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (3,733)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (3,773)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash provided by financing activities 215,446us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 80,594us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 300,014us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (736)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (65)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents  
Net change in cash and cash equivalents (256,736)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 51,698us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 241,075us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 331,224us-gaap_CashAndCashEquivalentsAtCarryingValue 279,526us-gaap_CashAndCashEquivalentsAtCarryingValue 38,451us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 74,488us-gaap_CashAndCashEquivalentsAtCarryingValue 331,224us-gaap_CashAndCashEquivalentsAtCarryingValue 279,526us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member]      
Cash flows from operating activities:      
Net income (loss) (189,543)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
117,634us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
149,426us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 138,313us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
93,579us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
63,022us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Write-down of oil and gas properties 351,192us-gaap_ImpairmentOfOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accretion expense 230us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
372us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
561us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Deferred income tax (benefit) provision (177,197)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(41,284)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(56,175)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Settlement of asset retirement obligations (201)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Non-cash stock compensation expense 11,325us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,347us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,699us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Excess tax benefits   (156)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(949)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Loss on early extinguishment of debt   27,279us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,972us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Non-cash interest expense 16,661us-gaap_OtherNoncashExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,219us-gaap_OtherNoncashExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,085us-gaap_OtherNoncashExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Non-cash (income) loss from investment in subsidiaries (133,336)sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(214,983)sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(223,555)sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in current income taxes 158us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,767us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,618us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in intercompany receivables/payables 114,056us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
186,903us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
275,819us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(Increase) decrease in accounts receivable 1,131us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(15,630)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(22,750)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(Increase) decrease in other current assets (6,238)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,752us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(2,836)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(Increase) decrease in inventory 2,415us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
583us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
436us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Decrease in accounts payable (662)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1,052)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,348us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Decrease in other current assets (16,946)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
40,543us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(5,311)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other (1,755)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
419us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
10,960us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by (used in) operating activities     228,370us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by operating activities 109,603us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
225,292us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash flows from investing activities:      
Investment in oil and gas properties (338,731)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(273,474)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(324,542)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sale of oil and gas properties, net of expenses 28,103us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,300us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
403us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Sale of fixed assets     134us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investment in fixed and other assets (10,182)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(6,816)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(13,370)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Change in restricted funds (177,647)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries   (14,000)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash used in investing activities (498,457)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(287,990)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(337,375)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash flows from financing activities:      
Proceeds from bank borrowings     25,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from issuance of common stock 225,999us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Repayment of bank borrowings     (70,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from issuance of senior convertible notes     300,000us-gaap_ProceedsFromConvertibleDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Deferred financing costs of senior convertible notes     (8,855)sgy_PaymentForFinancingCostsOfSeniorConvertibleNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from sold warrants     40,170us-gaap_ProceedsFromIssuanceOfWarrants
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Payments for purchased call options     (70,830)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Proceeds from issuance of senior notes   489,250us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
300,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Deferred financing costs (3,371)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(9,065)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(11,966)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Redemption of senior subordinated notes     (200,681)us-gaap_RepaymentsOfSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Redemption of senior notes   (396,014)us-gaap_RepaymentsOfSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Excess tax benefits   156us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
949us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net payments for share-based compensation (7,182)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,733)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(3,773)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by financing activities 215,446us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
80,594us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
300,014us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net change in cash and cash equivalents (173,408)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
17,896us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
191,009us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of year 246,294us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
228,398us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37,389us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of year 72,886us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
246,294us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
228,398us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor Subsidiary [Member]      
Cash flows from operating activities:      
Net income (loss) 133,304us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
215,009us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
223,555us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 201,693us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
256,995us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
281,152us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Accretion expense 28,181us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
33,203us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
32,513us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Deferred income tax (benefit) provision 75,020us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
120,913us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
125,750us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Settlement of asset retirement obligations (56,208)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(83,854)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(65,567)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-cash derivative expense (18,028)us-gaap_UnrealizedGainLossOnDerivatives
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,239us-gaap_UnrealizedGainLossOnDerivatives
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(509)us-gaap_UnrealizedGainLossOnDerivatives
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-cash (income) loss from investment in subsidiaries     75sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Change in intercompany receivables/payables (145,250)us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(186,947)us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(275,125)us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(Increase) decrease in accounts receivable 50,514us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
10,947us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(33,345)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(Increase) decrease in inventory (2,415)us-gaap_IncreaseDecreaseInInventories
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Decrease in accounts payable (2,757)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,454us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(208)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Decrease in other current assets (2,206)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,908us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(5,115)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other (1,496)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(2,972)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,661)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) operating activities     281,515us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash provided by operating activities 260,352us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
368,895us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Cash flows from investing activities:      
Investment in oil and gas properties (558,003)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(378,254)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(231,313)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of oil and gas properties, net of expenses 214,811us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
42,521us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net cash used in investing activities (343,192)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(335,733)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(231,313)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash flows from financing activities:      
Net change in cash and cash equivalents (82,840)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
33,162us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
50,202us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, beginning of year 84,290us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
51,128us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
926us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, end of year 1,450us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
84,290us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
51,128us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-Guarantor Subsidiaries [Member]      
Cash flows from operating activities:      
Net income (loss) 64us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(52)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(75)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization     191us-gaap_DepreciationDepletionAndAmortization
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Accretion expense     257us-gaap_AssetRetirementObligationAccretionExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Non-cash (income) loss from investment in subsidiaries (32)sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
26sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Change in intercompany receivables/payables 31,194us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
44us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(694)us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(Increase) decrease in accounts receivable (34)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
  224us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(Increase) decrease in other current assets (6)us-gaap_IncreaseDecreaseInOtherOperatingAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Decrease in accounts payable     (39)us-gaap_IncreaseDecreaseInAccountsPayable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash provided by (used in) operating activities     (136)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net cash provided by operating activities 31,186us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
18us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash flows from investing activities:      
Investment in oil and gas properties (30,513)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(11,571)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Change in restricted funds (425)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(1,742)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Investment in subsidiaries (31,696)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(13,404)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash used in investing activities (62,634)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(26,717)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash flows from financing activities:      
Equity proceeds from parent 31,696us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
27,404us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash provided by financing activities 31,696us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
27,404us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Effect of exchange rate changes on cash (736)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(65)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net change in cash and cash equivalents (488)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
640us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(136)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, beginning of year 640us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
  136us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, end of year 152us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
640us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Eliminations [Member]      
Cash flows from operating activities:      
Net income (loss) (133,368)us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(214,957)us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(223,480)us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Non-cash (income) loss from investment in subsidiaries 133,368sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
214,957sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
223,480sgy_NonCashIncomeLossFromInvestmentsInAffiliatesSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Cash flows from investing activities:      
Investment in subsidiaries 31,696us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
27,404us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash used in investing activities 31,696us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
27,404us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash flows from financing activities:      
Equity proceeds from parent (31,696)us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(27,404)us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash provided by financing activities $ (31,696)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
$ (27,404)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember