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Allowance Accounts (Schedule Of Allowance Accounts) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Deductions |  | $ 4,000 us-gaap_ValuationAllowancesAndReservesRecoveries / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Allowance for Doubtful Accounts [Member] | Helix [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Balance, Beginning Balance | 2,234 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 5,152 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 4,000 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember
Additions | 5,331 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 2,236 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 1,257 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember
Deductions | (2,830)us-gaap_ValuationAllowancesAndReservesRecoveries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | (5,154)us-gaap_ValuationAllowancesAndReservesRecoveries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | (105)us-gaap_ValuationAllowancesAndReservesRecoveries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember
Valuation Allowances and Reserves, Balance, Ending Balance | 4,735 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 2,234 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember | 5,152 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember
Valuation Allowance of Deferred Tax Assets [Member] | Helix [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation Allowances and Reserves, Balance, Beginning Balance | 22,860 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 16,391 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 14,310 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Additions | 216 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 6,469 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 2,081 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Valuation Allowances and Reserves, Balance, Ending Balance | 23,076 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 22,860 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 16,391 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
WOSEA [Member] | Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Additions |  | 6,500 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = hlx_WellOpsSeaPtyLimitedMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember | 2,000 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = hlx_WellOpsSeaPtyLimitedMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember
Oil And Gas Operations In United Kingdom [Member] | Valuation Allowance of Deferred Tax Assets [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Additions |  |  | $ 100 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = hlx_OilAndGasOperationsInUnitedKingdomMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of recoveries of amounts due the Entity that had previously been written off as uncollectible using allowances (the valuation accounts that are netted against the cost of an asset to value it at its carrying value) and total of reestablishments of reserves (liabilities established to represent expected future costs) that had previously been utilized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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