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v3.8.0.1

Organization (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 segment | Feb. 23, 2018 vessel
Segment Reporting Information [Line Items] |  |
Number of reportable segments | segment | 3 |
Scenario, Forecast [Member] | Well Intervention [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of chartered vessels |  | 2
Scenario, Forecast [Member] | Robotics [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of chartered vessels |  | 3

X
- Definition Number Of Chartered Vessels + References No definition available. + Details
Name: | hlx_NumberOfCharteredVessels
Namespace Prefix: | hlx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hlx_WellInterventionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hlx_RoboticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |