v3.5.0.2
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2016
Jul. 19, 2016
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2016  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2016  
Entity Registrant Name HELIX ENERGY SOLUTIONS GROUP INC  
Entity Central Index Key 0000866829  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   112,639,372
Entity Current Reporting Status Yes  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No