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Business Segment Information (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2014 segment
Segment Reporting Information [Line Items] |
Number of reportable segments | 4
Monohull Vessels [Member] |
Segment Reporting Information [Line Items] |
Number of vessels under construction | 2
Well Intervention [Member] |
Segment Reporting Information [Line Items] |
Number of vessels under construction | 2
Robotics [Member] | Long Term [Member] |
Segment Reporting Information [Line Items] |
Number of chartered vessels | 4

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: | duration

X
- Definition Number of Vessels Under Construction + References No definition available. + Details
Name: | hlx_NumberOfVesselsUnderConstruction
Namespace Prefix: | hlx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration