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Long-Term Debt (Interest Expense And Capitalized Interest) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Interest expense $ 33,064us-gaap_InterestExpense $ 44,484us-gaap_InterestExpense $ 53,601us-gaap_InterestExpense
Interest income (4,786)us-gaap_InterestIncomeOther (1,167)us-gaap_InterestIncomeOther (548)us-gaap_InterestIncomeOther
Capitalized interest (10,419)us-gaap_InterestCostsCapitalized (10,419)us-gaap_InterestCostsCapitalized (4,893)us-gaap_InterestCostsCapitalized
Net interest expense 17,859us-gaap_InterestIncomeExpenseNonoperatingNet 32,898us-gaap_InterestIncomeExpenseNonoperatingNet 48,160us-gaap_InterestIncomeExpenseNonoperatingNet
Energy Resource Technology GOM, Inc [Member]      
Debt Instrument [Line Items]      
Interest expense   $ 2,800us-gaap_InterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hlx_EnergyResourceTechnologyGomIncMember		 $ 28,600us-gaap_InterestExpense
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hlx_EnergyResourceTechnologyGomIncMember