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Employee Benefit Plans (Restricted Shares Granted) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, shares 139,455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 168,468us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 349,430us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Grant Share Amount A [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Jan. 02, 2014    
Share-based payment award, shares 73,609us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountMember
   
Share-based payment award, market value per share 23.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountMember
   
Share-based payment award, vesting percentage 33.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountMember
   
Share-based payment award, vesting period, in years 3 years    
Grant Share Amount B [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Jan. 02, 2014    
Share-based payment award, shares 73,609us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountBMember
   
Share-based payment award, market value per share 26.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountBMember
   
Share-based payment award, vesting percentage 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountBMember
   
Share-based payment award, vesting date Jan. 01, 2017    
Grant Share Amount C [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Jan. 02, 2014    
Share-based payment award, shares 2,724us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountCMember
   
Share-based payment award, market value per share 23.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountCMember
   
Share-based payment award, vesting percentage 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountCMember
   
Share-based payment award, vesting date Jan. 01, 2016    
Grant Share Amount D [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Apr. 01, 2014    
Share-based payment award, shares 4,051us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountDMember
   
Share-based payment award, market value per share 22.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountDMember
   
Share-based payment award, vesting percentage 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountDMember
   
Share-based payment award, vesting date Jan. 01, 2016    
Grant Share Amount E [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Jul. 01, 2014    
Share-based payment award, shares 3,397us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountEMember
   
Share-based payment award, market value per share 26.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountEMember
   
Share-based payment award, vesting percentage 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountEMember
   
Share-based payment award, vesting date Jan. 01, 2016    
Grant Share Amount F [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Oct. 01, 2014    
Share-based payment award, shares 3,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountFMember
   
Share-based payment award, market value per share 22.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountFMember
   
Share-based payment award, vesting percentage 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountFMember
   
Share-based payment award, vesting date Jan. 01, 2016    
Grant Share Amount G [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Share-based payment award, date of grant Dec. 04, 2014    
Share-based payment award, shares 51,792us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountGMember
   
Share-based payment award, market value per share 23.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountGMember
   
Share-based payment award, vesting percentage 33.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= hlx_GrantShareAmountGMember
   
Share-based payment award, vesting period, in years 3 years