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Business Segment Information (Intercompany Segment Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Assets	$ 2,648,324us-gaap_Assets	$ 2,700,698us-gaap_Assets
Well Intervention [Member]
Segment Reporting Information [Line Items]
Assets	1,486,347us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember	1,470,349us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember
Robotics [Member]
Segment Reporting Information [Line Items]
Assets	296,525us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember	299,701us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember
Production Facilities [Member]
Segment Reporting Information [Line Items]
Assets	452,582us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember	459,427us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Assets	$ 412,870us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	$ 471,221us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=hlx_ProductionFacilitiesMember
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_StatementBusinessSegmentsAxis=hlx_WellInterventionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: