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Equity Investments (Distributions From Equity Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | $ 8,790 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital | $ 12,260 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital | $ 16,230 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Deepwater Gateway, L.L.C. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | 6,150 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember | 7,600 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember | 8,157 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember
Independence Hub, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Distributions from equity investments | $ 2,640 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember | $ 4,660 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember | $ 8,073 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember

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- Definition Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities. + References No definition available. + Details
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