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Summary Of Significant Accounting Policies (Computations Of Basic And Diluted EPS) (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
Summary Of Significant Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) applicable to Helix | $ 7,960 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 75,586 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 57,782 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 53,719 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 36,503 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 44,593 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 27,211 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,615 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 195,047 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 109,922 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (46,334)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income from discontinued operations, net of tax |  |  |  |  |  | (44)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 29 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (1,058)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (1,073)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (23,684)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income from continuing operations |  |  |  |  | 36,503 us-gaap_IncomeLossFromContinuingOperations | 44,549 us-gaap_IncomeLossFromContinuingOperations | 27,240 us-gaap_IncomeLossFromContinuingOperations | 557 us-gaap_IncomeLossFromContinuingOperations | 195,047 us-gaap_IncomeLossFromContinuingOperations | 108,849 us-gaap_IncomeLossFromContinuingOperations | (70,018)us-gaap_IncomeLossFromContinuingOperations
Less: Undistributed net income allocable to participating securities |  |  |  |  |  |  |  |  | (1,018)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (801)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Net income applicable to common shareholders - continuing operations |  |  |  |  |  |  |  |  | 194,029 hlx_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations | 108,048 hlx_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations | (70,018)hlx_NetIncomeLossAvailableToCommonStockholdersBasicContinuingOperations
Less: Undistributed net income from discontinued operations allocable to participating securities |  |  |  |  |  |  |  |  |  | (8)hlx_UndiscountedNetIncomeFromDiscontinuedOperationsAllocableToParticipatingSecurities |
Net income applicable to common shareholders - discontinued operations |  |  |  |  |  |  |  |  |  | 1,065 hlx_NetIncomeLossAvailableToCommonStockholdersBasicDiscontinuedOperations | 23,684 hlx_NetIncomeLossAvailableToCommonStockholdersBasicDiscontinuedOperations
Weighted average number of shares outstanding - basic |  |  |  |  |  |  |  |  | 105,029 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 105,032 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 104,449 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Share-based awards other than participating securities, shares |  |  |  |  |  |  |  |  | 16 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 152 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Undistributed earnings reallocated to participating securities, value |  |  |  |  |  |  |  |  |  | 1 hlx_UndistributedEarningsReallocatedToParticipatingSecuritiesValue |
Net income applicable to Helix - Diluted |  |  |  |  |  |  |  |  | 194,029 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 108,049 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | (70,018)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average number of shares outstanding, diluted |  |  |  |  |  |  |  |  | 105,045 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 105,184 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 104,449 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income from discontinued operations, net of tax |  |  |  |  |  | $ 44 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (29)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 1,058 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | $ 1,073 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 23,684 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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