Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss), including noncontrolling interests	$ 195,550us-gaap_ProfitLoss	$ 113,049us-gaap_ProfitLoss	$ (43,156)us-gaap_ProfitLoss
Adjustments to reconcile net income (loss), including noncontrolling interests, to net cash provided by operating activities:
Income from discontinued operations, net of tax		(1,073)	(23,684)
Depreciation and amortization	109,345	98,535	97,201
Asset impairment charges			177,135us-gaap_AssetImpairmentCharges
Amortization of deferred financing costs	4,870us-gaap_AmortizationOfFinancingCosts	5,187us-gaap_AmortizationOfFinancingCosts	9,086us-gaap_AmortizationOfFinancingCosts
Stock-based compensation expense	3,133us-gaap_ShareBasedCompensation	8,307us-gaap_ShareBasedCompensation	7,627us-gaap_ShareBasedCompensation
Amortization of debt discount	5,596	5,172	9,729
Deferred income taxes	23,154us-gaap_DeferredIncomeTaxExpenseBenefit	(24,937)us-gaap_DeferredIncomeTaxExpenseBenefit	(69,584)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax from stock-based compensation	(68)	(219)	1,186
(Gain) loss on disposition of assets, net	(10,240)us-gaap_GainLossOnDispositionOfAssets	(14,727)us-gaap_GainLossOnDispositionOfAssets	13,476us-gaap_GainLossOnDispositionOfAssets
Loss on early extinguishment of debt		12,100	17,127
Unrealized (gain) loss and ineffectiveness on derivative contracts, net	1,320us-gaap_UnrealizedGainLossOnDerivatives	77us-gaap_UnrealizedGainLossOnDerivatives	(250)us-gaap_UnrealizedGainLossOnDerivatives
Changes in operating assets and liabilities:
Accounts receivable, net	43,963	(3,320)	(3,652)
Other current assets	(6,461)	14,277	(10,434)
Income tax payable	9,088	(56,164)	(16,812)
Accounts payable and accrued liabilities	12,841	(32,045)	73,448
Oil and gas asset retirement costs	(1,024)	(10,334)	(37,970)
Other noncurrent, net	(31,582)	(9,024)	(24,405)
Net cash provided by operating activities	359,485	104,861	176,068
Net cash provided by (used in) discontinued operations		(30,503)	276,430
Net cash provided by operating activities	359,485	74,358	452,498
Cash flows from investing activities:
Capital expenditures	(336,912)	(324,426)	(323,039)
Distributions from equity investments, net	7,911	9,295	7,797
Proceeds from sale of assets	13,574	189,054	19,530
Acquisition of noncontrolling interests	(20,085)
Net cash used in investing activities	(335,512)	(126,077)	(295,712)
Net cash provided by (used in) discontinued operations		582,965	(120,057)
Net cash provided by (used in) investing activities	(335,512)	456,888	(415,769)
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes		(281,490)us-gaap_EarlyRepaymentOfSeniorDebt	(209,500)us-gaap_EarlyRepaymentOfSeniorDebt
Borrowings under revolving credit facility		47,617	100,000
Repayment of revolving credit facility		(147,617)
Issuance of Convertible Senior Notes due 2032			200,000us-gaap_ProceedsFromConvertibleDebt
Repurchase of Convertible Senior Notes due 2025		(3,487)us-gaap_RepaymentsOfConvertibleDebt	(298,288)us-gaap_RepaymentsOfConvertibleDebt
Proceeds from term loans		300,000	100,000
Repayment of term loans	(15,000)us-gaap_RepaymentsOfSecuredDebt	(374,681)us-gaap_RepaymentsOfSecuredDebt	(12,569)us-gaap_RepaymentsOfSecuredDebt
Repayment of MARAD borrowings	(5,376)hlx_RepaymentsOfLongTermSecuredDebt	(5,120)hlx_RepaymentsOfLongTermSecuredDebt	(4,877)hlx_RepaymentsOfLongTermSecuredDebt
Deferred financing costs	(3,586)us-gaap_PaymentsOfFinancingCosts	(10,954)us-gaap_PaymentsOfFinancingCosts	(7,580)us-gaap_PaymentsOfFinancingCosts
Distributions to noncontrolling interests	(1,018)us-gaap_PaymentsToMinorityShareholders	(4,097)us-gaap_PaymentsToMinorityShareholders	(5,287)us-gaap_PaymentsToMinorityShareholders
Repurchases of common stock	(8,382)	(11,256)	(7,197)
Excess tax from stock-based compensation	68	219	(1,186)
Exercise of stock options, net and other		734	1,252
Proceeds from issuance of ESPP shares	3,223us-gaap_ProceedsFromStockPlans	2,711us-gaap_ProceedsFromStockPlans
Net cash used in financing activities	(30,071)	(487,421)	(145,232)
Effect of exchange rate changes on cash and cash equivalents	4,390	(2,725)	(860)
Net increase (decrease) in cash and cash equivalents	(1,708)	41,100	(109,363)
Cash and cash equivalents:
Balance, beginning of year	478,200	437,100	546,463
Balance, end of year	$ 476,492	$ 478,200	$ 437,100

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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