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Employee Benefit Plans - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2007
May 20, 2011
Employee Benefit And Retirement Plans [Line Items]          
Liability of vested benefits recorded in other long term liabilities $ 858us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability        
Expenses related to incentive compensation bonus 10,361us-gaap_OtherLaborRelatedExpenses 15,340us-gaap_OtherLaborRelatedExpenses 8,113us-gaap_OtherLaborRelatedExpenses    
Percentage of vesting of an employee in matching contributions for each year of service 20.00%sgy_PercentageOfVestingOfEmployeeInMatchingContributionsForEachYearOfService        
Number of years required for vesting of contribution 5 years        
Amount of contribution by the company to Stone Energy 401 (k) Profit Sharing Plan 1,989us-gaap_DefinedBenefitPlanContributionsByEmployer 1,793us-gaap_DefinedBenefitPlanContributionsByEmployer 1,759us-gaap_DefinedBenefitPlanContributionsByEmployer    
Maximum Percentage of Deferred Compensation plan 100.00%sgy_MaximumPercentageOfDeferredCompensationPlan        
Plan assets included in other assets 8,425us-gaap_DeferredCompensationPlanAssets 8,248us-gaap_DeferredCompensationPlanAssets      
Number of times of severance payments relating to annual base salary and any target bonus at one hundred percent level 2.99sgy_NumberOfTimesOfSeverancePaymentsRelatingToAnnualPayAndAnyTargetBonusAtOneHundredPercentLevel        
Percentage of employer matching contribution under 401(k) plan 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch        
Maximum gross-up payment to executives 110.00%sgy_PercentageOfMaximumGrossUpPaymentsToExecutives        
Amount of one week's pay of each full of annual pay under Employee severance Plan       $ 10,000us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits  
Period of involuntary termination of employment       6 months  
Minimum [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Maximum period of sum of payments and benefits under employee severance plan       84 days  
Maximum [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Maximum period of sum of payments and benefits under employee severance plan       12 months  
2009 plan [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Additional number of common stock to be issued under incentive stock options         2,800,000sgy_AdditionalNumberOfCommonStockToBeIssuedUnderIncentiveStockOptions
/ us-gaap_AwardTypeAxis
= sgy_TwoThousandNinePlanMember
Additional shares available for issuance 1,563,967us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= sgy_TwoThousandNinePlanMember
       
2009 plan [Member] | All Employee [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Vesting period of stock options 5 years        
Period after which stock option will expire subsequent to award 10 years        
2009 plan [Member] | Non - Employee Directors [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Vesting period of stock options 3 years        
Period after which stock option will expire subsequent to award 10 years        
Restricted Stock Grants [Member] | Minimum [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Vesting period of stock options 1 year        
Restricted Stock Grants [Member] | Maximum [Member]          
Employee Benefit And Retirement Plans [Line Items]          
Vesting period of stock options 3 years