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Business Segment Information (Summary Of Financial Data By Segment) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
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 | Jun. 30, 2013 | Jul. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 207,160,000 us-gaap_SalesRevenueNet | $ 340,837,000 us-gaap_SalesRevenueNet | $ 305,587,000 us-gaap_SalesRevenueNet | $ 253,572,000 us-gaap_SalesRevenueNet | $ 226,837,000 us-gaap_SalesRevenueNet | $ 220,117,000 us-gaap_SalesRevenueNet | $ 232,178,000 us-gaap_SalesRevenueNet | $ 197,429,000 us-gaap_SalesRevenueNet | $ 1,107,156,000 us-gaap_SalesRevenueNet | $ 876,561,000 us-gaap_SalesRevenueNet | $ 846,109,000 us-gaap_SalesRevenueNet |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | 261,756,000 us-gaap_OperatingIncomeLoss | 179,034,000 us-gaap_OperatingIncomeLoss | (68,483,000)us-gaap_OperatingIncomeLoss |  |
Net interest expense and other |  |  |  |  |  |  |  |  | 114,000 hlx_NetInterestExpenseAndOther | 38,411,000 hlx_NetInterestExpenseAndOther | 65,949,000 hlx_NetInterestExpenseAndOther |  |
Equity in earnings of investments |  |  |  |  |  |  |  |  | 879,000 us-gaap_IncomeLossFromEquityMethodInvestments | 2,965,000 us-gaap_IncomeLossFromEquityMethodInvestments | 8,434,000 us-gaap_IncomeLossFromEquityMethodInvestments |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 262,521,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 143,588,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (125,998,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 66,971,000 us-gaap_IncomeTaxExpenseBenefit | 31,612,000 us-gaap_IncomeTaxExpenseBenefit | (59,158,000)us-gaap_IncomeTaxExpenseBenefit |  |
Total assets | 2,700,698,000 us-gaap_Assets |  |  |  | 2,544,280,000 us-gaap_Assets |  |  |  | 2,700,698,000 us-gaap_Assets | 2,544,280,000 us-gaap_Assets | 3,386,580,000 us-gaap_Assets |  |
Capital expenditures |  |  |  |  |  |  |  |  | 336,912,000 us-gaap_PaymentsToAcquireProductiveAssets | 324,426,000 us-gaap_PaymentsToAcquireProductiveAssets | 323,039,000 us-gaap_PaymentsToAcquireProductiveAssets |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 109,345,000 us-gaap_DepreciationDepletionAndAmortization | 98,535,000 us-gaap_DepreciationDepletionAndAmortization | 97,201,000 us-gaap_DepreciationDepletionAndAmortization |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  |  |  |  | 10,240,000 us-gaap_GainLossOnDispositionOfAssets | 14,727,000 us-gaap_GainLossOnDispositionOfAssets | (13,476,000)us-gaap_GainLossOnDispositionOfAssets |  |
Other income - oil and gas |  |  |  |  |  |  |  |  | 16,931,000 us-gaap_OtherNonoperatingIncome | 6,581,000 us-gaap_OtherNonoperatingIncome |  |  |
Proceeds from insurance reimbursement |  |  |  |  |  |  |  |  | 7,200,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities |  |  |  |
Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (74,450,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (68,607,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (133,775,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember |  |
Well Intervention [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 667,849,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 452,452,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 378,546,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | 204,810,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 131,840,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 85,482,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Net interest expense and other |  |  |  |  |  |  |  |  | (6,915,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | (217,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 2,152,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 211,725,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 132,057,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 83,205,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 50,102,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 26,718,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 15,400,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Total assets | 1,470,349,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |  |  | 1,245,229,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |  |  | 1,470,349,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 1,245,229,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 936,926,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Capital expenditures |  |  |  |  |  |  |  |  | 283,635,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 283,132,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 274,451,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 57,570,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 44,619,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | 37,736,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Well Intervention [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (29,875,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | (22,448,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember | (36,781,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_WellInterventionMember |  |
Robotics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 420,224,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 333,246,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 328,726,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | 68,329,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 44,132,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 55,678,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Net interest expense and other |  |  |  |  |  |  |  |  | 7,304,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | (210,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | (1,203,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 61,025,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 44,342,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 56,881,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 21,612,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 15,530,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 20,222,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Total assets | 299,701,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |  |  | 282,373,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |  |  | 299,701,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 282,373,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 258,117,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Capital expenditures |  |  |  |  |  |  |  |  | 51,348,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 39,655,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 44,500,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 24,478,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 22,263,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | 19,933,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Robotics [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (44,575,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | (41,169,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember | (46,465,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_RoboticsMember |  |
Production Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 93,175,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 88,149,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 80,091,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | 41,138,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 49,778,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 40,082,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Net interest expense and other |  |  |  |  |  |  |  |  | 384,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 380,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 365,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 41,633,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 52,363,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 48,276,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 14,395,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 17,233,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 15,784,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Total assets | 459,427,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |  |  | 495,829,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |  |  | 459,427,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 495,829,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 504,828,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Capital expenditures |  |  |  |  |  |  |  |  | 869,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 1,252,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 823,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,278,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 17,193,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | 16,828,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Production Facilities [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (4,673,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember | (46,057,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_ProductionFacilitiesMember |  |
Subsea Construction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 358,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 71,321,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 192,521,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | 10,923,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 33,685,000 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | (148,862,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Net interest expense and other |  |  |  |  |  |  |  |  | (278,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 480,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | (247,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 11,201,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 33,205,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | (148,615,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 3,881,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 11,655,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | (51,329,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Total assets | 27,547,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |  |  | 38,054,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |  |  | 27,547,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 38,054,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 303,479,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 8,651,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | 19,773,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Subsea Construction [Member] | Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (317,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember | (4,472,000)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = hlx_SubseaConstructionMember |  |
Spoolbase Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  |  |  |  | 10,500,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_SpoolbaseFacilityMember |  |  |  |
Caesar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | (1,100,000)us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_CaesarMember |
Asset impairment |  |  |  |  |  |  |  |  |  |  | 157,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementBusinessSegmentsAxis = hlx_CaesarMember |  |
Express [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  |  | 15,600,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = hlx_ExpressMember
Intrepid Vessel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment |  |  |  |  |  |  |  |  |  |  | 14,600,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementBusinessSegmentsAxis = hlx_IntrepidVesselMember |  |
Intercompany Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (74,450,000)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (68,607,000)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (133,775,000)us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (921,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (3,360,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember | (7,878,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember |  |
Corporate And Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest expense and other |  |  |  |  |  |  |  |  | (381,000)hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | 37,978,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | 64,882,000 hlx_NetInterestExpenseAndOther / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (63,063,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | (118,379,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | (165,745,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember |  |
Provision for income taxes |  |  |  |  |  |  |  |  | (23,019,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | (39,524,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | (59,235,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,019,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | 5,809,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember | 2,931,000 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = hlx_CorporateAndEliminationsMember |  |
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (62,523,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (77,041,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (92,985,000)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Total assets | 443,674,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 482,795,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 443,674,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 482,795,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 483,003,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Capital expenditures |  |  |  |  |  |  |  |  | 1,060,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 387,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,265,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  | $ 900,227,000 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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