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Business Segment Information (Revenue By Geographical Region) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues | $ 207,160 us-gaap_SalesRevenueNet | $ 340,837 us-gaap_SalesRevenueNet | $ 305,587 us-gaap_SalesRevenueNet | $ 253,572 us-gaap_SalesRevenueNet | $ 226,837 us-gaap_SalesRevenueNet | $ 220,117 us-gaap_SalesRevenueNet | $ 232,178 us-gaap_SalesRevenueNet | $ 197,429 us-gaap_SalesRevenueNet | $ 1,107,156 us-gaap_SalesRevenueNet | $ 876,561 us-gaap_SalesRevenueNet | $ 846,109 us-gaap_SalesRevenueNet
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 403,994 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_UnitedStatesMember | 345,525 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_UnitedStatesMember | 281,308 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_UnitedStatesMember
North Sea [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 504,016 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember | 403,816 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember | 345,074 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember
North Sea [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 362,700 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember / us-gaap_SubsegmentsAxis = hlx_UnitedKingdomMember | 327,100 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember / us-gaap_SubsegmentsAxis = hlx_UnitedKingdomMember | 283,100 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_NorthSeaMember / us-gaap_SubsegmentsAxis = hlx_UnitedKingdomMember
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | $ 199,146 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_OtherGeographicRegionMember | $ 127,220 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_OtherGeographicRegionMember | $ 219,727 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = hlx_OtherGeographicRegionMember

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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