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Business Segment Information (Intercompany Segment Assets) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Segment Reporting Information [Line Items] |  |
Assets | $ 2,648,324 us-gaap_Assets | $ 2,700,698 us-gaap_Assets
Well Intervention [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,486,347 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 1,470,349 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember
Robotics [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 296,525 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 299,701 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember
Production Facilities [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 452,582 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 459,427 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 412,870 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ 471,221 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Details
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- Details
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- Details
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- Details
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