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Employee Benefit Plans (Restricted Shares Granted) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, shares | 139,455 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 168,468 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 349,430 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Grant Share Amount A [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Jan. 02, 2014 |  |
Share-based payment award, shares | 73,609 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountMember |  |
Share-based payment award, market value per share | 23.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountMember |  |
Share-based payment award, vesting percentage | 33.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountMember |  |
Share-based payment award, vesting period, in years | 3 years |  |
Grant Share Amount B [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Jan. 02, 2014 |  |
Share-based payment award, shares | 73,609 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountBMember |  |
Share-based payment award, market value per share | 26.79 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountBMember |  |
Share-based payment award, vesting percentage | 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountBMember |  |
Share-based payment award, vesting date | Jan. 01, 2017 |  |
Grant Share Amount C [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Jan. 02, 2014 |  |
Share-based payment award, shares | 2,724 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountCMember |  |
Share-based payment award, market value per share | 23.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountCMember |  |
Share-based payment award, vesting percentage | 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountCMember |  |
Share-based payment award, vesting date | Jan. 01, 2016 |  |
Grant Share Amount D [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Apr. 01, 2014 |  |
Share-based payment award, shares | 4,051 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountDMember |  |
Share-based payment award, market value per share | 22.98 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountDMember |  |
Share-based payment award, vesting percentage | 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountDMember |  |
Share-based payment award, vesting date | Jan. 01, 2016 |  |
Grant Share Amount E [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Jul. 01, 2014 |  |
Share-based payment award, shares | 3,397 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountEMember |  |
Share-based payment award, market value per share | 26.31 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountEMember |  |
Share-based payment award, vesting percentage | 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountEMember |  |
Share-based payment award, vesting date | Jan. 01, 2016 |  |
Grant Share Amount F [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Oct. 01, 2014 |  |
Share-based payment award, shares | 3,882 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountFMember |  |
Share-based payment award, market value per share | 22.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountFMember |  |
Share-based payment award, vesting percentage | 100.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountFMember |  |
Share-based payment award, vesting date | Jan. 01, 2016 |  |
Grant Share Amount G [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Share-based payment award, date of grant | Dec. 04, 2014 |  |
Share-based payment award, shares | 51,792 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountGMember |  |
Share-based payment award, market value per share | 23.17 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountGMember |  |
Share-based payment award, vesting percentage | 33.00%hlx_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = hlx_GrantShareAmountGMember |  |
Share-based payment award, vesting period, in years | 3 years |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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