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Equity Investments (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 equity_investment | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |
Number of equity investments | 2 hlx_NumberOfEquityInvestments |
Equity investments in unconsolidated affiliates | $ 148,147,000 us-gaap_EquityMethodInvestments | $ 149,623,000 us-gaap_EquityMethodInvestments
Deepwater Gateway, L.L.C. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember |
Equity investments in unconsolidated affiliates | 80,100,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember | 80,900,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember
Capitalized interest | 1,200,000 hlx_CapitalizedInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember | 1,200,000 hlx_CapitalizedInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_DeepwaterGatewayLLCMember
Independence Hub, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember |
Equity investments in unconsolidated affiliates | 68,000,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember | 68,800,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember
Capitalized interest | $ 3,900,000 hlx_CapitalizedInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember | $ 3,900,000 hlx_CapitalizedInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember
Water depth | 8,000 hlx_WaterDepth / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = hlx_IndependenceHubLlcMember |

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- Definition The number of equity investments. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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