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Summary Of Significant Accounting Policies (Goodwill - Narrative and Schedule Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 01, 2014 segment | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |  |
Number of reporting units | 2 us-gaap_NumberOfReportingUnits |  |  |
Goodwill, Beginning Balance |  | $ 63,230 us-gaap_Goodwill | $ 62,935 us-gaap_Goodwill |
Goodwill, Other Changes |  | (1,084)us-gaap_GoodwillOtherChanges | 295 us-gaap_GoodwillOtherChanges |
Goodwill, Ending Balance |  | 62,146 us-gaap_Goodwill | 63,230 us-gaap_Goodwill |
Well Intervention [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  | 18,123 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 17,828 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |
Goodwill, Other Changes |  | (1,084)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 295 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |
Goodwill, Ending Balance |  | 17,039 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 18,123 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |
Robotics [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Beginning Balance |  |  |  | 45,107 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember
Goodwill, Ending Balance |  | $ 45,107 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | $ 45,107 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | $ 45,107 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |