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Summary Of Significant Accounting Policies (Excluded Securities On Diluted Shares Calculation) (Details)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Diluted (in shares) 105,045us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 105,184us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 104,449us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Total     105,165hlx_WeightedAverageNumberOfDilutedSharesIncludingAntiDilutiveSecurities
Share-based Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities     382us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Convertible Preferred Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities     334us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertiblePreferredStockMember