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v3.21.2

Long-Term Debt - Former Nordea Q5000 Loan (Details) $ in Millions | Jan. 31, 2021 USD ($)
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Nordea Q5000 Loan Matured January 2021 |
Debt Instrument [Line Items] |
Balloon payment | $ 53.6

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- 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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=hlx_NordeaQ5000LoanMaturingJanuary2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |