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Details Of Certain Accounts (Other Current Assets) (Details) (USD $)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Note receivable     $ 10,000,000us-gaap_NotesAndLoansReceivableGrossCurrent [1] $ 17,500,000us-gaap_NotesAndLoansReceivableGrossCurrent [1]
Other receivables     613,000us-gaap_OtherReceivablesNetCurrent 423,000us-gaap_OtherReceivablesNetCurrent
Prepaid insurance     3,523,000us-gaap_PrepaidInsurance 6,582,000us-gaap_PrepaidInsurance
Other prepaids     8,631,000us-gaap_OtherPrepaidExpenseCurrent 15,541,000us-gaap_OtherPrepaidExpenseCurrent
Spare parts inventory     2,112,000us-gaap_Supplies 1,857,000us-gaap_Supplies
Value added tax receivable     8,046,000us-gaap_ValueAddedTaxReceivableCurrent 9,326,000us-gaap_ValueAddedTaxReceivableCurrent
Other     91,000us-gaap_OtherAssetsMiscellaneousCurrent 72,000us-gaap_OtherAssetsMiscellaneousCurrent
Total other current assets     33,016,000us-gaap_OtherAssetsCurrent 51,301,000us-gaap_OtherAssetsCurrent
Note receivable, interest rate     6.00%hlx_NotesReceivableInterestStatedRatePercentage  
Financing receivable, gross     20,000,000us-gaap_NotesReceivableGross  
Scenario, Forecast [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Note receivable, periodic principal payment $ 10,000,000us-gaap_ProceedsFromCollectionOfNotesReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		 $ 10,000,000us-gaap_ProceedsFromCollectionOfNotesReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		    
[1] Relates to the remaining balance of the promissory note we received in connection with the sale of our Ingleside spoolbase in January 2014. Interest on the note is payable quarterly at a rate of 6% per annum. Under the terms of the note, the remaining $20 million principal balance is required to be paid with a $10 million payment on December 31 of 2015 and 2016, respectively.