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Employee Benefits Plans and Share-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 21, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Capitalized costs, Oil and natural gas properties         $ 1,088,984 $ 1,039,919  
Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share based compensation grants 22,963            
Options conversion percentage in common stock shares     60.00%        
Options conversion percentage in cash     40.00%        
Compensation expense recognized period     11 months        
Compensation expense unrecognized   $ 700 $ 700        
Compensation expense liabilities     $ 300        
Executive Severance Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Termination period     12 months        
Compensation expense accrued   5,100 $ 5,100        
Executive Severance Plan | General and Administrative Expense              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense recognized   $ 7,500 $ 7,500        
Long Term Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-Based Compensation authorized to grant   5,415,576 5,415,576        
Share-Based Compensation issued     0        
Talos Energy LLC Series B Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Capitalized costs, Oil and natural gas properties   $ 200 $ 200 $ 500 900 1,200 $ 1,900
Unrecognized compensation expense         3,400    
Unrecognized compensation expense to be recognized over remainder of requisite service period         $ 1,100    
Requisite service period         4 years    
Talos Energy LLC Series B Units | Series A Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense recognized period         24 months    
Percentage of compounded annual returns attained covenant     8.00%   8.00%    
Unrecognized compensation expense to be recognized upon recoganization of Series A payout         $ 2,200    
Talos Energy LLC Series B Units | Series C Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Distribution paid     $ 25,000   $ 25,000    
Talos Energy LLC Series B Units | Series B Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-Based Compensation authorized to grant         1,000,000    
Compensation expense recognized period     21 months        
Unrecognized compensation expense   2,900 $ 2,900        
Unrecognized compensation expense to be recognized over remainder of requisite service period   700 $ 700        
Requisite service period     4 years        
Unrecognized compensation expense to be recognized upon recoganization of Series A payout   2,200 $ 2,200        
Talos Energy LLC Series B Units | General and Administrative Expense              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense     200 500 $ 900 $ 1,100 $ 1,700
New Talos Energy LLC Series B Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Capitalized costs, Oil and natural gas properties   2,300 2,300      
Unrecognized compensation expense   2,400 2,400        
Unrecognized compensation expense to be recognized over remainder of requisite service period   300 $ 300        
Requisite service period     4 years        
New Talos Energy LLC Series B Units | New Series B Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Distribution paid     $ 102,000        
Percentage of units to be vested covenant     80.00%        
Vesting period     4 years        
New Talos Energy LLC Series B Units | New Series A Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense recognized period     11 months        
Unrecognized compensation expense to be recognized upon recoganization of Series A payout   $ 2,100 $ 2,100        
New Talos Energy LLC Series B Units | General and Administrative Expense              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Compensation expense     $ 1,300