XML 34 R87.htm IDEA: XBRL DOCUMENT v2.4.1.9
Business Segment Information (Narrative) (Details)
 12 Months Ended
Dec. 31, 2014
segment
Segment Reporting Information [Line Items]  
Number of reportable segments 4us-gaap_NumberOfReportableSegments
Well Intervention [Member]  
Segment Reporting Information [Line Items]  
Number of vessels under construction 2hlx_NumberOfVesselsUnderConstruction
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hlx_WellInterventionMember
Monohull Vessels [Member]  
Segment Reporting Information [Line Items]  
Number of vessels under construction 2hlx_NumberOfVesselsUnderConstruction
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hlx_MonohullVesselsMember
Number of chartered vessels 2hlx_NumberOfCharteredVessels
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hlx_MonohullVesselsMember
Robotics [Member]  
Segment Reporting Information [Line Items]  
Number of chartered vessels 4hlx_NumberOfCharteredVessels
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hlx_RoboticsMember