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Long-Term Debt (Former Credit Facility) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2013
Debt Instrument [Line Items]        
Repayment of Helix Term Notes $ 15,000us-gaap_RepaymentsOfSecuredDebt $ 374,681us-gaap_RepaymentsOfSecuredDebt $ 12,569us-gaap_RepaymentsOfSecuredDebt  
Amortization of deferred financing costs 4,870us-gaap_AmortizationOfFinancingCosts 5,187us-gaap_AmortizationOfFinancingCosts 9,086us-gaap_AmortizationOfFinancingCosts  
Former Credit Facility [Member]        
Debt Instrument [Line Items]        
Repayment of Helix Term Notes       318,400us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= hlx_FormerCreditFacilityMember
Former Term Loan [Member]        
Debt Instrument [Line Items]        
Amortization of deferred financing costs   $ 3,500us-gaap_AmortizationOfFinancingCosts
/ us-gaap_LongtermDebtTypeAxis
= hlx_FormerTermLoanMember