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Summary Of Significant Accounting Policies (Earnings Per Share - Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Convertible Senior Notes 2025 [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Convertible debt stock price trigger | $ 38.57 us-gaap_DebtInstrumentConvertibleStockPriceTrigger / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotesMember |  |
Convertible Senior Notes 2025 [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities | 9,300 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hlx_ConvertibleSeniorNotesMember |  |
Convertible Senior Notes 2032 [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Anti-dilutive securities |  | 8,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hlx_ConvertibleSeniorNotes2032Member | 8,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hlx_ConvertibleSeniorNotes2032Member

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