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v2.4.1.9

Long-Term Debt (Former Credit Facility) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2013
Debt Instrument [Line Items] |  |  |  |
Repayment of Helix Term Notes | $ 15,000 us-gaap_RepaymentsOfSecuredDebt | $ 374,681 us-gaap_RepaymentsOfSecuredDebt | $ 12,569 us-gaap_RepaymentsOfSecuredDebt |
Amortization of deferred financing costs | 4,870 us-gaap_AmortizationOfFinancingCosts | 5,187 us-gaap_AmortizationOfFinancingCosts | 9,086 us-gaap_AmortizationOfFinancingCosts |
Former Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Helix Term Notes |  |  |  | 318,400 us-gaap_RepaymentsOfSecuredDebt / us-gaap_LongtermDebtTypeAxis = hlx_FormerCreditFacilityMember
Former Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amortization of deferred financing costs |  | $ 3,500 us-gaap_AmortizationOfFinancingCosts / us-gaap_LongtermDebtTypeAxis = hlx_FormerTermLoanMember |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |