XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments And Contingencies And Other Matters - Narrative (Details) | 6 Months Ended
--- | ---
Jun. 30, 2021
Siem Helix 1 and Siem Helix 2 |
Commitments And Contingencies [Line Items] |
Term of charter agreement | 7 years

X
- Definition Commitments And Contingencies [Line Items] + References No definition available. + Details
Name: | hlx_CommitmentsAndContingenciesLineItems
Namespace Prefix: | hlx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of charter agreement in years. + References No definition available. + Details
Name: | hlx_TermOfCharterAgreement
Namespace Prefix: | hlx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=hlx_SiemHelix1AndSiemHelix2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |