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Acquisitions - Business Combination - Additional Information (Details) $ in Thousands							12 Months Ended
	Nov. 16, 2020 USD ($)	Aug. 05, 2020 USD ($) Property shares	Mar. 30, 2020 shares	Feb. 28, 2020 USD ($) shares	Dec. 10, 2019	May 10, 2018 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Senior Notes | Second Priority Senior Secured Notes
Business Acquisition [Line Items]
Senior notes, stated interest rate						11.00%
ILX and Castex
Business Acquisition [Line Items]
Aggregate consideration of cash				$ 385,000
Acquisition, transaction related cost				12,100
Purchase price				$ 459,322
ILX and Castex | General and Administrative Expense
Business Acquisition [Line Items]
Acquisition, transaction related cost							$ 8,700	$ 3,400
ILX and Castex | Contingent Convertible Preferred Stock
Business Acquisition [Line Items]
Conversion stock issued to sellers | shares				11,000,000.0
Stone Energy Corporation
Business Acquisition [Line Items]
Acquisition, transaction related cost									$ 88,600
Purchase price						$ 731,964
Acquisition, transaction related fees to note holders and for seismic use agreements									56,100
Acquisition, transaction related fees paid to note holders									9,300
Acquisition, transaction related fees for seismic use agreements									46,800
Stone Energy Corporation | General and Administrative Expense
Business Acquisition [Line Items]
Acquisition, transaction related cost									$ 32,500
Talos Energy LLC Stakeholders | Talos Energy Inc.
Business Acquisition [Line Items]
Percentage of voting interest acquired						63.00%
Talos Energy LLC Stakeholders | ILX and Castex
Business Acquisition [Line Items]
Aggregate consideration of cash				$ 385,000
Closing date of merger agreement					Jul. 01, 2019
Talos Energy LLC Stakeholders | ILX and Castex | Common Stock
Business Acquisition [Line Items]
Conversion of stock, new issuance | shares			11,000,000.0
Talos Energy LLC Stakeholders | ILX and Castex | Series A Convertible Preferred Stock
Business Acquisition [Line Items]
Aggregate shares issued | shares			110,000	110,000
Conversion of stock, new issuance | shares			11,000,000.0
Stone Energy Corporation Stockholders | Talos Energy Inc.
Business Acquisition [Line Items]
Percentage of voting interest acquired						37.00%
LLOG Acquisition
Business Acquisition [Line Items]
Aggregate consideration of cash	$ 13,200
Acquisition, transaction related cost	$ 200
Castex 2005 Acquisition
Business Acquisition [Line Items]
Aggregate consideration of cash		$ 6,500					6,500
Acquisition, transaction related cost		$ 1,400					1,413
Number of properties | Property		16
Purchase price							$ 43,306
Castex 2005 Acquisition | Common Stock
Business Acquisition [Line Items]
Aggregate shares issued | shares		4,600,000					4,602,460

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