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Derivative Instruments And Hedging Activities (Narrative) (Details) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Feb. 28, 2013 Oil And Gas Commodity Contracts [Member] USD ($) | Feb. 28, 2013 Interest Rate Swaps [Member] USD ($) | Sep. 30, 2013 Interest Rate Swaps [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I I [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I I [Member] NOK | Feb. 28, 2013 Grand Canyon I I [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I [Member] NOK | Jan. 31, 2013 Grand Canyon [Member] USD ($) | Jan. 31, 2013 Grand Canyon [Member] NOK
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative cash settlement |  | $ 22.5 hlx_DerivativeCashSettlement / us-gaap_DerivativeInstrumentRiskAxis = hlx_OilAndGasCommodityContractMember | $ 0.6 hlx_DerivativeCashSettlement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |  |
Notional amount of derivative |  |  |  | 148.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 98.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonIIIMember | 595.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonIIIMember | 100.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonIIMember | 594.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonIIMember | 104.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonMember | 591.3 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = hlx_GrandCanyonMember
Loss on foreign currency cash flow hedge ineffectiveness | 1.7 us-gaap_GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness |  |  |  |  |  |  |  |  |
Cash flow hedge loss to be reclassified within twelve months | $ 7.8 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |  |  |  |  |  |  |  |  |

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- Definition The amount of cash paid on settlement of derivative. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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