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Summary Of Significant Accounting Policies (Debt Discount - Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2012
Debt Instrument [Line Items] |  |  |
Unamortized debt discount | $ 20,920 us-gaap_DebtInstrumentUnamortizedDiscount | $ 26,516 us-gaap_DebtInstrumentUnamortizedDiscount |
Convertible Senior Notes 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt discount | $ 20,920 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member | $ 26,500 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member | $ 35,400 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member
Expected life used to estimate fair value | 6 years |  |

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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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