XML 61 R44.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Organization (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2016 USD ($) | Feb. 28, 2014 vessel | Feb. 28, 2013 USD ($) | Dec. 31, 2015 segment vessel
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |
Number of reportable segments | segment |  |  |  | 3
Segment Reporting Information [Line Items] |  |  |  |
Proceeds from sale of business | $ |  |  | $ 624 |
Deepwater Gateway, LLC [Member] | Subsequent Event [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sale of ownership interest for cash | $ | $ 25 |  |  |
Robotics [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of chartered vessels |  |  |  | 4
Monohull Vessels [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of vessels under construction |  | 2 |  |
Monohull Vessels [Member] | Well Intervention [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of vessels under construction |  |  |  | 2

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
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=hlx_DeepwaterGatewayLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=hlx_MonohullVesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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