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Commitments And Contingencies And Other Matters (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Sep. 30, 2013
Commitments And Contingencies [Line Items] |  |  |  |  |
Property and equipment | $ 2,241,444,000 us-gaap_PropertyPlantAndEquipmentGross | $ 1,963,706,000 us-gaap_PropertyPlantAndEquipmentGross |  |  |
Charter fee deposit | 12,544,000 us-gaap_DepositsAssetsNoncurrent |  |  |  |
Operating leases, rent expense, net | 147,200,000 us-gaap_OperatingLeasesRentExpenseNet | 102,100,000 us-gaap_OperatingLeasesRentExpenseNet | 85,000,000 us-gaap_OperatingLeasesRentExpenseNet |  |
Operating leases, rent expense, sublease rentals | 800,000 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 | 400,000 us-gaap_OperatingLeasesRentExpenseSubleaseRentals1 |  |  |
Operating leases, future minimum payments due, future minimum sublease rentals | 2,000,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |  |  |  |
Q5000 [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Long-term purchase commitment |  |  |  | 386,500,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q5000Member |
Payments to acquire property, plant, and equipment | 289,400,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q5000Member |  |  |  |
Property and equipment | 342,400,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q5000Member |  |  |  |
Robotics [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Term Of Charter Agreement | 5 years |  |  |  |
Q7000 [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Long-term purchase commitment |  |  |  |  | 346,000,000 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q7000Member
Payments to acquire property, plant, and equipment | 69,200,000 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q7000Member |  |  |  |
Property and equipment | 91,800,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q7000Member |  |  |  |
Q7000 [Member] | Contract Signing [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Long-term purchase commitment percentage | 20.00%hlx_LongTermPurchaseCommitmentPercentage / us-gaap_OtherCommitmentsAxis = hlx_ContractSigningMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q7000Member |  |  |  |
Q7000 [Member] | Vessel Delivery [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Long-term purchase commitment percentage | 80.00%hlx_LongTermPurchaseCommitmentPercentage / us-gaap_OtherCommitmentsAxis = hlx_VesselDeliveryMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_Q7000Member |  |  |  |
Topside Equipment [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Property and equipment | $ 52,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_TopsideEquipmentMember |  |  |  |
Monohull Vessels [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Number of vessels under construction | 2 hlx_NumberOfVesselsUnderConstruction / us-gaap_PropertyPlantAndEquipmentByTypeAxis = hlx_MonohullVesselsMember |  |  |  |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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