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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Mar. 06, 2012
Building [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Estimated useful life of building 39 years      
1.75% Senior Convertible Notes due 2017 [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Aggregate principal amount of debt issued   $ 300,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember		   $ 300,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember
Senior convertible note, maturity year   2017    
Senior convertible note, stated interest rate 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember		 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember		 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember