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Long-Term Debt - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 1,044,675us-gaap_LongTermDebtNoncurrent $ 1,041,035us-gaap_LongTermDebtNoncurrent
1.75% Senior Convertible Notes due 2017 [Member]    
Debt Instrument [Line Items]    
Long-term debt 269,700us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= sgy_SeniorConvertibleNotesDueTwoThousandSeventeenMember		 266,000us-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