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General information - Additional Information (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
rig
drilling_unit
Jul. 24, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]          
Number of offshore drilling units owned and operated | drilling_unit 32        
Number of rigs | rig 1        
Debt due within one year     $ 6,177,000    
Percentage of consenting lenders holding senior secured debt 57.80%        
Cash and cash equivalents $ 644,000   723,000 $ 1,020,000 $ 1,357,000
Unrestricted cash and cash equivalents $ 428,000   $ 526,000    
Subsequent event          
Subsequent Event [Line Items]          
Plan of reorganization, new financing raised   $ 350,000      
Plan of reorganization, reduction of liabilities   4,900,000      
Plan of reorganization, first lien exit facility   $ 300,000      
Plan of reorganization, percentage of new equity securities issued to lenders   16.75%      
Plan of reorganization, amount of senior debt exchanged   $ 5,600,000      
Plan of reorganization, amount of second lien debt issued in exchange transaction   $ 750,000      
Plan of reorganization, percentage of equity securities issued in exchange for extinguishment of debt   83.00%      
Plan of reorganization, general unsecured claims, total available pro rata share amount   $ 250      
Plan of reorganization, percentage of equity securities issued to existing shareholders   0.25%      
Subsequent event | Hemen Holding Ltd. | Investor          
Subsequent Event [Line Items]          
Plan of reorganization, new financing raised   $ 50,000      
Plan of reorganization, convertible financing, percent of equity issuable under specified conditions   5.00%