Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and Equipment (Details) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended
Property and Equipment (Details) - USD ($)	Feb. 05, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 1,155,725,000	$ 1,178,688,000		$ 4,777,697,000
Loss on impairment	0	0	$ 1,119,517,000
Drilling equipment and facilities
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		1,085,292,000		4,476,960,000
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 75,159,000	83,591,000		99,812,000
Other
Property, Plant and Equipment [Line Items]
Property and equipment, at cost		$ 9,805,000		$ 200,925,000