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Fresh Start Accounting - Schedule of Fresh Start Accounting Adjustments (Details) - USD ($) $ in Thousands |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Repayments of Lines of Credit |  | $ 0 | $ 0 | $ (15,000) | $ (215,000)
Operating Lease, Right-of-Use Asset |  |  | (20,500) | (35,800) |
Operating Lease, Liability |  |  | 22,500 | 37,300 |
Accrued Liabilities and Other Liabilities | $ 216,500 | 216,500 |  |  |
Other Liabilities, Noncurrent | (565,400) | (565,400) | (581,100) | (762,400) |
Liabilities Subject to Compromise | 0 | 0 | 0 | (7,313,700) |
Treasury Stock, Value | 0 | 0 | 0 | (76,200) |
Warrants and Rights Outstanding | 16,400 | 16,400 | 16,400 | 0 |
Retained Earnings (Accumulated Deficit) | 0 | 0 | 33,000 | 4,183,800 |
Inventory |  |  | 0 | 279,400 |
Other | 90,500 | 90,500 | 117,800 | 386,500 |
Contract with Customer, Asset, after Allowance for Credit Loss | 2,200 | 2,200 | 300 | 1,800 |
Other Deferred Costs, Net |  |  | 26,900 | 17,400 |
OTHER ASSETS | 165,300 | 165,300 | 176,000 | 176,200 |
Contract with Customer, Liability, Current |  |  | 45,800 | 57,600 |
Operating Lease, Liability, Current |  |  | 10,000 | 15,700 |
Other liabilities (long-term) | (186,100) | (186,100) | (204,000) | (296,600) |
Property and equipment, net | 909,100 | 909,100 | 890,900 | 10,960,500 | $ 15,096,900
Accrued liabilities and other |  |  | 196,200 | 250,400 |
Intangible Liabilities Noncurrent |  |  | $ 0 | $ 50,400 |
Reorganization, Chapter 11, Plan Effect Adjustment |  |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt | 500,000 |  |  |  |
Proceeds from Loans | 20,000 |  |  |  |
Proceeds from Decommissioning Trust Fund Assets | 17,600 |  |  |  |
Repayments of Lines of Credit | (129,900) |  |  |  |
Transfer Of Funds To Escrow | (42,700) |  |  |  |
Professional Fees | (29,000) |  |  |  |
Other Cash | (8,600) |  |  |  |
Cash and Cash Equivalents, Period Increase (Decrease) | 327,400 |  |  |  |
Compensation and Benefits Trust | (17,600) | (17,600) |  |  |
Operating Lease, Right-of-Use Asset | (5,500) | (5,500) |  |  |
Other Assets, Fair Value Disclosure | 13,100 | 13,100 |  |  |
Other Assets | (10,000) | (10,000) |  |  |
Accounts Payable, Professional Fees | 26,100 | 26,100 |  |  |
Accounts Payable, Pre-Emergence Professional Fees | (12,600) | (12,600) |  |  |
Accounts Payable, Other | (400) | (400) |  |  |
Accounts Payable, Trade | 13,100 | 13,100 |  |  |
Operating Lease, Liability | (5,000) | (5,000) |  |  |
Accrued Liabilities, Holding Costs | (4,100) | (4,100) |  |  |
Accrued Liabilities, Restructuring Payments | (3,300) | (3,300) |  |  |
Accrued Liabilities and Other Liabilities | (12,400) | (12,400) |  |  |
Liabilities, Construction Contract Intangible Liabilities | (49,900) | (49,900) |  |  |
Liabilities, Accrued Holding Costs | (4,700) | (4,700) |  |  |
Liabilities, Lease Liabilities | (600) | (600) |  |  |
Other Liabilities, Noncurrent | (55,200) | (55,200) |  |  |
Liabilities Subject to Compromise | 7,313,700 | 7,313,700 |  |  |
Liabilities Subject to Compromise, Payments under Bankruptcy Court Order for Resolutions of Contingencies Subject to Chapter 11 | (129,900) |  |  |  |
Liabilities Subject to Compromise, Period Increase (Decrease) | 6,139,000 |  |  |  |
Settlement On Liabilities Subject To Compromise | (6,139,000) | (6,139,000) |  |  |
Issuance of Common Shares for backstop premium | 29,100 | 29,100 |  |  |
Issuance of Common Shares to the Shipyard | 5,400 | 5,400 |  |  |
Write-off of unrecognized share-based compensation expense | 16,000 | 16,000 |  |  |
Professional fees and success fees | 35,900 | 35,900 |  |  |
Backstop Commitment Agreement, Backstop Premium For Retained Deficit | 30,000 | 30,000 |  |  |
Impact of newbuild contract amendments | 350,700 | 350,700 |  |  |
Reorganization Items, Net | (5,671,900) | (5,671,900) |  |  |
Common shares, value | 800 | 800 |  |  |
Treasury Stock, Value | 75,500 | 75,500 |  |  |
Predecessor Additional Paid In Capital, Adjustment | (7,856,400) | (7,856,400) |  |  |
Equity Component Of Convertible Notes | (220,000) | (220,000) |  |  |
Cash And Equity Compensation Plans | (583,600) | (583,600) |  |  |
Warrants and Rights Outstanding | 16,400 | 16,400 |  |  |
Retained Earnings (Accumulated Deficit) | (14,322,600) | (14,322,600) |  |  |
Other | 1,500 | 1,500 |  |  |
OTHER ASSETS | 10,000 | 10,000 |  |  |
Property and equipment, net | (417,600) | (417,600) |  |  |
Reorganization, Chapter 11, Plan Effect Adjustment | Common Class A And B Shares |  |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Common shares, value | (82,600) | (82,600) |  |  |
Reorganization, Chapter 11, Plan Effect Adjustment | Predecessor Creditors And The Shipyard |  |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Liabilities Subject To Compromise, Stock Issued | (721,000) |  |  |  |
Reorganization, Chapter 11, Plan Effect Adjustment | Backstop Parties |  |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Liabilities Subject To Compromise, Stock Issued | (323,800) |  |  |  |
Reorganization, Chapter 11, Fresh-Start Adjustment |  |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset | (400) | (400) |  |  |
Other Assets | (20,700) | (20,700) |  |  |
Accounts Payable, Trade | (36,800) | (36,800) |  |  |
Accrued Liabilities and Other Liabilities | (61,800) | (61,800) |  |  |
Liabilities, Lease Liabilities | (1,100) | (1,100) |  |  |
Other Liabilities, Noncurrent | 85,600 | 85,600 |  |  |
Liabilities Subject to Compromise | 0 | 0 |  |  |
Common shares, value | 0 | 0 |  |  |
Treasury Stock, Value | 0 | 0 |  |  |
Warrants and Rights Outstanding | 0 | 0 |  |  |
Retained Earnings (Accumulated Deficit) | 9,175,200 | 9,175,200 |  |  |
Inventory | (260,800) | (260,800) |  |  |
Other Asset, Other, Current | (20,300) | (20,300) |  |  |
Other | (281,100) | (281,100) |  |  |
Deferred Income Taxes and Other Assets, Noncurrent | 21,100 | 21,100 |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 8,500 | 8,500 |  |  |
Deferred Contract Drilling | (16,500) | (16,500) |  |  |
Other Deferred Costs, Net | (4,600) | (4,600) |  |  |
OTHER ASSETS | 8,900 | 8,900 |  |  |
Historical Deferred Revenues | (25,900) | (25,900) |  |  |
Contract with Customer, Liability, Current | 500 | 500 |  |  |
Operating Lease, Liability, Current | 400 | 400 |  |  |
Other liabilities (long-term) | (82,700) | (82,700) |  |  |
Historical Deferred Revenues, Noncurrent | (5,900) | (5,900) |  |  |
Deferred Tax Impacts Of Certain Fresh Start Adjustments | 1,700 | 1,700 |  |  |
Other Sundry Liabilities | 200 | 200 |  |  |
Prepaid Expense and Other Assets, Current | (281,100) | (281,100) |  |  |
Property and equipment, net | (8,699,700) | (8,699,700) |  |  |
Intangible Assets, Net (Excluding Goodwill) | 8,500 | 8,500 |  |  |
Equity Method Investments | (43,400) | (43,400) |  |  |
Accounts and Financing Receivable, after Allowance for Credit Loss | (214,400) | (214,400) |  |  |
Accrued liabilities and other | 62,800 | 62,800 |  |  |
Intangible Liabilities Noncurrent | (500) | (500) |  |  |
Other Sundry Liabilities, Noncurrent | 87,300 | 87,300 |  |  |
Predecessor, Accumulated Other Comprehensive Loss | (93,400) | (93,400) |  |  |
Loss On Fresh-Start Adjustments | (9,194,600) | (9,194,600) |  |  |
Tax Impact Of Fresh Start Adjustments | $ 19,400 | $ 19,400 |  |  |

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