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Business Segment Information (Intercompany Segment Gross Profit (Loss)) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Gross profit (loss) with other operating segments of same entity | $ 7,878 | $ (93) | $ 19,112
Contracting Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross profit (loss) with other operating segments of same entity | 8,053 | 104 | 15,655
Production Facilities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross profit (loss) with other operating segments of same entity | $ (175) | $ (197) | $ 3,457

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- Definition Gross profit (loss) with other operating segments of same entity. + References No definition available. + Details
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Namespace Prefix: | hlx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration