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Long-Term Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Gross Carrying Amount | $ 36,458 us-gaap_DeferredFinanceCostsNoncurrentGross | $ 32,872 us-gaap_DeferredFinanceCostsNoncurrentGross
Accumulated Amortization | (13,059)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts | (8,575)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts
Net | 23,399 us-gaap_DeferredFinanceCostsNoncurrentNet | 24,297 us-gaap_DeferredFinanceCostsNoncurrentNet
Term Loan Maturing June 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Gross Carrying Amount | 3,638 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member | 3,638 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member
Accumulated Amortization | (1,091)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member | (364)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member
Net | 2,547 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member | 3,274 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_TermLoanMaturingJune2018Member
Revolving Credit Facility Maturing June 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Gross Carrying Amount | 13,275 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member | 13,275 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member
Accumulated Amortization | (3,982)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member | (1,327)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member
Net | 9,293 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member | 11,948 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_RevolvingCreditFacilityMaturingJune2018Member
Convertible Senior Notes 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Gross Carrying Amount | 3,759 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member | 3,759 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member
Accumulated Amortization | (1,763)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member | (1,148)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member
Net | 1,996 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member | 2,611 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_ConvertibleSeniorNotes2032Member
MARAD Debt [Member] |  |
Debt Instrument [Line Items] |  |
Gross Carrying Amount | 12,200 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember | 12,200 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember
Accumulated Amortization | (6,223)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember | (5,736)us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember
Net | 5,977 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember | 6,464 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_MaradDebtMember
Nordea Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Gross Carrying Amount | 3,586 us-gaap_DeferredFinanceCostsNoncurrentGross / us-gaap_LongtermDebtTypeAxis = hlx_NordeaTermLoanMember |
Net | $ 3,586 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_LongtermDebtTypeAxis = hlx_NordeaTermLoanMember |

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- Definition Carrying amount of accumulated amortization of long-term deferred finance costs capitalized at the end of the reporting period. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods after one year or beyond the normal operating cycle, if longer, over the life of the long-term debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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