Additional security on secure financial assurances.

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Basis of presentation and schedule of accounting policy.

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Debt instrument discount rate at issuance.

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Reclassification from accounts payable to accrued liabilities.

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Reclassification from other current assets to prepaid assets.

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Shares issued on exchange agreement.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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Face amount per share of no-par value common stock.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Formation and Basis of Presentation - Additional Information (Details)				6 Months Ended		12 Months Ended
	May 10, 2018 USD ($) $ / shares shares	Nov. 21, 2017 USD ($) shares	Feb. 06, 2013 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016	Dec. 29, 2016 USD ($)	Apr. 15, 2015	Feb. 03, 2013 USD ($)
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Common stock par value \| $ / shares	$ 0.01
Percentage of voting interest acquired	63.00%	63.00%
Senior notes, maturity date				Feb. 28, 2019		Feb. 28, 2019
Reclassification from accounts payable to accrued liabilities						$ 73,500,000
Reclassification from other current assets to prepaid assets						$ 7,300,000
Number of reportable segment \| Segment				1
Private equity capital commitment receivable				$ 600,000,000
Proceeds from contributions from affiliates for acquisition and other asset purchases				$ 0	$ 0
Interest rate, stated percentage								$ 500,000
9.75% Senior Notes – due July 2022
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Debt instrument interest rate				9.75%		9.75%
Senior notes, maturity date				Jul. 05, 2022		Jul. 05, 2022
Senior Notes
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Debt instrument interest rate									11.00%
Senior Notes \| 9.75% Senior Notes
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Proceeds from issuance of senior notes		$ 102,000,000
Debt instrument interest rate		9.75%		9.75%
Shares issued on exchange agreement \| shares		2,874,049
Senior Notes \| 9.75% Senior Notes – due July 2022
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Debt instrument interest rate				9.75%		9.75%	9.75%
Senior notes, maturity date				Jul. 31, 2022		Jul. 05, 2022	Jul. 05, 2022
Senior notes, principal amount						$ 102,000,000
Senior Notes \| 7.50% Senior Secured Notes due 2022
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Debt instrument interest rate		7.50%
Proceeds from Issuance of senior secured notes in exchange of 11% senior secured notes		$ 137,400,000
Bridge Loans \| 11.00% Bridge Loans
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Debt instrument interest rate		11.00%
Proceeds from issuance of bridge loans in exchange of 11% senior secured notes		$ 172,000,000
Stone Energy Corporation
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Closing date of merger agreement				May 10, 2018
Percentage of voting interest acquired	37.00%	37.00%
Total consideration and fair value	$ 731,964,000
Talos Production LLC
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Percentage of voting interest acquired	100.00%
Share issed on merger \| shares	31,244,085
E R T Acquisition \| Nine Point Seven Five Two Thousand Eighteen Senior Notes
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Senior notes, maturity date						Feb. 15, 2018
Proceeds from contributions from affiliates for acquisition and other asset purchases						$ 325,000,000
Senior notes, principal amount						300,000,000
Interest rate, stated percentage						9,750,000
Discount rate						$ 975,000
Private Equity Funds
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Private equity capital commitment receivable										$ 600,000,000
Helix Energy Solutions Group Inc \| E R T Acquisition
Basis Of Presentation And Schedule Of Accounting Policy [Line Items]
Total consideration and fair value			$ 625,200,000
Purchase price and working capital adjustments			$ 15,200,000