Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Operations [Abstract]
Net revenues	$ 1,107,156us-gaap_SalesRevenueNet	$ 876,561us-gaap_SalesRevenueNet	$ 846,109us-gaap_SalesRevenueNet
Cost of sales:
Cost of sales	763,120us-gaap_ContractRevenueCost	615,876us-gaap_ContractRevenueCost	619,059us-gaap_ContractRevenueCost
Asset impairment charges			177,135us-gaap_AssetImpairmentCharges
Total cost of sales	763,120us-gaap_CostOfRevenue	615,876us-gaap_CostOfRevenue	796,194us-gaap_CostOfRevenue
Gross profit	344,036us-gaap_GrossProfit	260,685us-gaap_GrossProfit	49,915us-gaap_GrossProfit
Loss on commodity derivative contracts		(14,113)	(10,507)
Gain (loss) on disposition of assets, net	10,240us-gaap_GainLossOnDispositionOfAssets	14,727us-gaap_GainLossOnDispositionOfAssets	(13,476)us-gaap_GainLossOnDispositionOfAssets
Selling, general and administrative expenses	(92,520)	(82,265)	(94,415)
Income (loss) from operations	261,756us-gaap_OperatingIncomeLoss	179,034us-gaap_OperatingIncomeLoss	(68,483)us-gaap_OperatingIncomeLoss
Equity in earnings of investments	879	2,965	8,434
Net interest expense	(17,859)	(32,898)	(48,160)
Loss on early extinguishment of long-term debt		(12,100)	(17,127)
Other income (expense), net	814us-gaap_OtherNonoperatingIncomeExpense	6us-gaap_OtherNonoperatingIncomeExpense	(662)us-gaap_OtherNonoperatingIncomeExpense
Other income - oil and gas	16,931us-gaap_OtherNonoperatingIncome	6,581us-gaap_OtherNonoperatingIncome
Income (loss) before income taxes	262,521	143,588	(125,998)
Income tax provision (benefit)	66,971us-gaap_IncomeTaxExpenseBenefit	31,612us-gaap_IncomeTaxExpenseBenefit	(59,158)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) from continuing operations	195,550	111,976	(66,840)
Income from discontinued operations, net of tax		1,073	23,684
Net income (loss), including noncontrolling interests	195,550us-gaap_ProfitLoss	113,049us-gaap_ProfitLoss	(43,156)us-gaap_ProfitLoss
Less net income applicable to noncontrolling interests	(503)	(3,127)	(3,178)
Net income (loss) applicable to Helix	$ 195,047	$ 109,922	$ (46,334)
Basic earnings (loss) per share of common stock:
Continuing operations	$ 1.85	$ 1.03	$ (0.67)
Discontinued operations		$ 0.01	$ 0.23
Net income (loss) per common share	$ 1.85us-gaap_EarningsPerShareBasic	$ 1.04us-gaap_EarningsPerShareBasic	$ (0.44)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share of common stock:
Continuing operations	$ 1.85	$ 1.03	$ (0.67)
Discontinued operations		$ 0.01	$ 0.23
Net income (loss) per common share	$ 1.85us-gaap_EarningsPerShareDiluted	$ 1.04us-gaap_EarningsPerShareDiluted	$ (0.44)us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic	105,029	105,032	104,449
Diluted	105,045	105,184	104,449

Amount of increase (decrease) in fair value of commodity derivatives recognized in income.

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

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-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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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.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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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 210.5-03.4)

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-Publisher FASB

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-Topic 330

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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