Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 23, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	$ 169,379	$ 556,066	$ 733,687	$ 980,644
Operating expenses:
Depreciation	92,758	68,504	320,085	355,596
General and administrative	15,036	53,494	56,925	67,878
Impairment of assets	197,027	132,449	842,016
Restructuring and separation costs			17,724
(Gain) loss on disposition of assets	(5,486)	(1,024)	(7,375)	1,072
Total operating expenses	496,438	707,246	1,886,828	1,262,974
Operating loss	(327,059)	(151,180)	(1,153,141)	(282,330)
Other income (expense):
Interest income	30	3	484	6,382
Interest expense, (excludes $35,390 and $98,027 of contractual interest expense on debt subject to compromise for the period from January 1, 2021 through April 23, 2021 and the year ended December 31, 2020, respectively)	(34,827)	(26,180)	(42,585)	(122,832)
Foreign currency transaction loss	(172)	(997)	(4,498)	(3,936)
Reorganization items, net	(1,639,763)	(8,088)	(76,910)
Other, net	398	10,752	560	702
Loss before income tax (expense) benefit	(2,001,393)	(175,690)	(1,276,090)	(402,014)
Income tax (expense) benefit	39,404	(1,654)	21,186	44,800
Net loss	$ (1,961,989)	$ (177,344)	$ (1,254,904)	$ (357,214)
Loss per share, Basic and Diluted	$ (14.21)	$ (1.77)	$ (9.09)	$ (2.60)
Weighted-average shares outstanding, Basic and Diluted	138,054	100,071	137,996	137,652
Contract Drilling [Member]
Revenues:
Total revenues	$ 153,364	$ 465,328	$ 692,753	$ 934,934
Operating expenses:
Contract drilling, excluding depreciation	181,626	364,539	618,553	793,412
Reimbursable Expenses [Member]
Revenues:
Total revenues	16,015	90,738	40,934	45,710
Operating expenses:
Contract drilling, excluding depreciation	$ 15,477	$ 89,284	$ 38,900	$ 45,016