ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 21, 2017	Sep. 30, 2017	Mar. 01, 2017	Feb. 27, 2017
Schedule Of Significant Accounting Policies [Line Items]
Restricted cash		$ 18,742,000
Building
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful life of building		39 years
7.5% Second Lien Notes | Second Lien Notes
Schedule Of Significant Accounting Policies [Line Items]
Interest rate						7.50%
Predecessor
Schedule Of Significant Accounting Policies [Line Items]
Restricted cash			$ 0
Predecessor | Foreign Currency Items | Other operational expenses
Schedule Of Significant Accounting Policies [Line Items]
Reclassification from accumulated other comprehensive income			$ 6,081,000
Talos Energy, Inc. | Forecast
Schedule Of Significant Accounting Policies [Line Items]
Percentage of outstanding stock	37.00%
Talos Energy, Inc. | 9.75% Senior Notes Due 2022 | Senior Notes
Schedule Of Significant Accounting Policies [Line Items]
Aggregate principal amount of senior notes				$ 102,000,000
Interest rate				9.75%
Talos Energy, Inc. | 11% Second Lien Notes | Second Lien Notes
Schedule Of Significant Accounting Policies [Line Items]
Interest rate		11.00%
Talos Energy, Inc. | Talos Production | Forecast
Schedule Of Significant Accounting Policies [Line Items]
Percentage of outstanding stock	100.00%
Talos Energy, Inc. | Stone Energy Corp. | Forecast
Schedule Of Significant Accounting Policies [Line Items]
Number of New Talos shares issued (in shares)	34.1
Talos Energy | Talos Energy, Inc. | Forecast
Schedule Of Significant Accounting Policies [Line Items]
Percentage of outstanding stock	63.00%
Franklin Advisors, Inc. and MacKay Shields LLC | Stone Energy Corp.
Schedule Of Significant Accounting Policies [Line Items]
Investment managers voting percentage in Stone Energy					53.00%
Disposal Group, Disposed of by Sale | Appalachia Properties
Schedule Of Significant Accounting Policies [Line Items]
Net consideration received for sale of Appalachia Properties							$ 522,500,000
Disposal Group, Disposed of by Sale | Appalachia Properties | Predecessor
Schedule Of Significant Accounting Policies [Line Items]
Net consideration received for sale of Appalachia Properties							$ 522,500,000