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Employment Benefit Plan - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2007
Dec. 31, 2007
Minimum
Dec. 31, 2007
Maximum
Dec. 31, 2012
2009 plan
May 20, 2011
2009 plan
Dec. 31, 2012
2009 plan
All Employee
Y
Dec. 31, 2012
2009 plan
Non - Employee Directors
Y
Dec. 31, 2012
Restricted Stock Grants
Minimum
Dec. 31, 2012
Restricted Stock Grants
Maximum
Employee Benefit And Retirement Plans [Line Items]                        
Liability of vested benefits recorded in other long term liabilities $ 1,059                      
Expenses related to incentive compensation bonus 8,113 11,600 5,888                  
Additional number of common stock to be issued under incentive stock options               2,800,000        
Vesting period of stock options                 5 years 3 years 1 year 3 years
Period after which stock option will expire subsequent to award                 10 10    
Additional shares available for issuance             2,684,466          
Percentage of vesting of an employee in matching contributions for each year of service 20.00%                      
Number of years required for vesting of contribution 5 years                      
Amount of contribution by the company to Stone Energy 401 (k) Profit Sharing Plan 1,759 1,435 1,301                  
Maximum Percentage of Deferred Compensation plan 100.00%                      
Plan assets included in other assets 7,498 6,410                    
Number of times of severance payments relating to annual pay and any target bonus at one hundred percent level 2.99                      
Percentage of excise tax rate under Section 4999 of the Internal revenue code 20.00%                      
Percentage of employer matching contribution under 401(k) plan 50.00%                      
Amount of one week's pay of each full of annual pay under Employee severance Plan       $ 10,000                
Maximum period of sum of payments and benefits under employee severance plan         84 days 12 months            
Period of involuntary termination of employment       6 months