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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% |  |  |

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