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Related Party Transactions - Additional Information (Details)						1 Months Ended	12 Months Ended
	Mar. 30, 2020 shares	Feb. 28, 2020 USD ($) shares	Dec. 10, 2019	Aug. 31, 2018 USD ($)	May 10, 2018 Registration Offering	Aug. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 21, 2017
Related Party Transaction [Line Items]
Net of cash acquired							$ 315,962,000	$ 37,916,000	$ (278,409,000)
7.50% Senior Notes – due May 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							7.50%	7.50%
11.00% Second-Priority Senior Secured Notes – due April 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							11.00%	11.00%
Bridge Loans
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage									11.00%
Senior Notes \| 7.50% Senior Notes – due May 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							7.50%		7.50%	7.50%
Senior Notes \| 11.00% Second-Priority Senior Secured Notes – due April 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							11.00%		11.00%	11.00%
Original Equity Registration Rights Agreement
Related Party Transaction [Line Items]
Fees incurred in conjunction with agreement							$ 200,000	$ 700,000	$ 1,800,000
Whistler Energy II, LLC
Related Party Transaction [Line Items]
Purchase price				$ 52,600,000
Available cash acquired				$ 37,800,000
Stone Energy Corporation
Related Party Transaction [Line Items]
Closing date of merger agreement							May 10, 2018
Work fees to debt holders									9,300,000
Stone Energy Corporation \| 7.50% Senior Notes – due May 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							7.50%
Stone Energy Corporation \| 11.00% Second-Priority Senior Secured Notes – due April 2022
Related Party Transaction [Line Items]
Debt instrument, interest rate, stated percentage							11.00%
Apollo Funds \| Whistler Energy II, LLC \| Whistler Energy II Holdco, LLC
Related Party Transaction [Line Items]
Net of cash acquired						$ 14,800,000
Business acquisition, date of acquisition agreement						Aug. 31, 2018
Aggregate consideration of cash						$ 52,600,000
Available cash acquired						$ 37,800,000
Primary fair values of receivables acquired							$ 1,100,000
Franklin Advisers, Inc. and MacKay Shields LLC \| Registration Rights Agreement
Related Party Transaction [Line Items]
Number of days required to file shelf registration statement					30 days
Number of demand registrations allowed in any twelve-month period \| Registration					2
Number of underwritten offerings to demand in any twelve-month period \| Offering					3
Number of underwritten offerings to demand \| Offering					1
Percentage of registrable securities owned, underwritten offerings					5.00%
Threshold percentage of outstanding shares of common stock for termination of agreement					5.00%
Registration agreement, termination description								The Registration Rights Agreement has terminated with respect to Franklin and will terminate with respect to MacKay Shields in the event that MacKay Shields ceases to beneficially own 5% or more of the then outstanding shares of the Company’s common stock. The Registration Rights Agreement will otherwise terminate at such time as there are no Registrable Securities outstanding.
Vinson & Elkins L.L.P.
Related Party Transaction [Line Items]
Legal fees incurred							3,500,000	$ 4,200,000	4,400,000
Legal fees payable							700,000	$ 2,300,000	1,100,000
Apollo and Riverstone Funds
Related Party Transaction [Line Items]
Work fees to debt holders									4,100,000
Apollo and Riverstone Funds \| Service Fee Agreement \| Shareholder Service
Related Party Transaction [Line Items]
Service fee									500,000
Apollo and Riverstone Funds \| Service Fee Agreement \| Shareholder Service \| Maximum
Related Party Transaction [Line Items]
Service fee							$ 500,000
Apollo and Riverstone Funds \| Stone Energy Corporation \| Service Fee Agreement \| Shareholder Service
Related Party Transaction [Line Items]
Closing date of merger agreement							May 10, 2018
Franklin and McKay Noteholders
Related Party Transaction [Line Items]
Work fees to debt holders									$ 3,300,000
ILX and Castex
Related Party Transaction [Line Items]
Purchase price		$ 459,322,000
Net of cash acquired		303,122,000
Aggregate consideration of cash		385,000,000
ILX and Castex \| Talos Energy LLC Stakeholders
Related Party Transaction [Line Items]
Aggregate consideration of cash		$ 385,000,000.0
Closing date of merger agreement			Jul. 01, 2019
ILX and Castex \| Series A Convertible Preferred Stock \| Talos Energy LLC Stakeholders
Related Party Transaction [Line Items]
Share issued on merger \| shares	110,000	110,000
Shares issued upon conversion \| shares	11,000,000.0
ILX and Castex \| Riverstone Funds
Related Party Transaction [Line Items]
Purchase price		$ 459,300,000
Business combination, conversion stock		156,200,000
Net of cash acquired		$ 303,100,000