Company Overview (Details) $ in Thousands	1 Months Ended	6 Months Ended
May 31, 2022 USD ($)	Jun. 30, 2022 USD ($) segment item
Segment Reporting Information [Line Items]
Number of reportable segments \| segment		3
Distribution from equity investment, net		$ 7,840
Well Intervention
Segment Reporting Information [Line Items]
Number of long-term chartered vessels \| item		2
Production Facilities \| Independence Hub, LLC
Segment Reporting Information [Line Items]
Percentage of ownership interest		20.00%
Distribution from equity investment, net	$ 7,800

Number Of Long Term Chartered Vessels

No definition available.

Name:	hlx_NumberOfLongTermCharteredVessels
Namespace Prefix:	hlx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of distribution received from equity method investee for return on investment, classified as investing activities. Excludes distribution for return of investment, classified as investing activities.

+ References

No definition available.

+ Details

Name:	hlx_ProceedsFromEquityMethodInvestmentDistributionInvestingActivities
Namespace Prefix:	hlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- 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

- Details

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

- Details

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=hlx_IndependenceHubLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: