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Oil And Gas Properties (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Feb. 28, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Oil And Gas Properties [Line Items] |  |  |  |
Proceeds from divestiture of business | $ 624 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |
Proceeds from insurance reimbursement |  | 7.2 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |  |
Camelot Field [Member] |  |  |  |
Oil And Gas Properties [Line Items] |  |  |  |
Asset retirement obligation |  | 0.6 us-gaap_AssetRetirementObligation / us-gaap_StatementGeographicalAxis = hlx_CamelotFieldMember | 1.1 us-gaap_AssetRetirementObligation / us-gaap_StatementGeographicalAxis = hlx_CamelotFieldMember | 2.9 us-gaap_AssetRetirementObligation / us-gaap_StatementGeographicalAxis = hlx_CamelotFieldMember
Asset retirement obligation revision of estimate |  |  | 1.6 us-gaap_AssetRetirementObligationRevisionOfEstimate / us-gaap_StatementGeographicalAxis = hlx_CamelotFieldMember | 15.5 us-gaap_AssetRetirementObligationRevisionOfEstimate / us-gaap_StatementGeographicalAxis = hlx_CamelotFieldMember
Gulf Of Mexico Oil And Gas Properties [Member] |  |  |  |
Oil And Gas Properties [Line Items] |  |  |  |
Asset retirement obligation, cash paid to settle |  |  | $ 5.2 us-gaap_AssetRetirementObligationCashPaidToSettle / us-gaap_StatementBusinessSegmentsAxis = hlx_GulfOfMexicoOilAndGasPropertiesMember |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3337-108585 + Details
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