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Long-Term Debt - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 1,041,035us-gaap_LongTermDebtNoncurrent $ 1,027,084us-gaap_LongTermDebtNoncurrent
1.75% Senior Convertible Notes due 2017 [Member]    
Debt Instrument [Line Items]    
Long-term debt 266,035us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember		 252,084us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember
7.5% Senior Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt 775,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorNotesDueTwoThousandTwentyTwoMember		 775,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorNotesDueTwoThousandTwentyTwoMember
Bank debt [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_BankDebtMember