Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Equipment-type and Country (Detail) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 23, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 169,379	$ 556,066	$ 841,278	$ 733,687
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	153,364	465,328	724,744	692,753
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	16,015	90,738	116,534	40,934
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	100,263	250,383	397,090	334,412
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	93,215	194,912	322,021	321,150
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	7,048	55,471	75,069	13,262
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	21,728	110,733	107,021	77,147
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	17,031	95,601	92,939	63,876
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	4,697	15,132	14,082	13,271
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	30,267	59,104	74,594	121,050
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	27,967	55,245	66,116	112,121
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,300	3,859	8,478	8,929
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues		58,868	166,503
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues		48,758	154,574
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues		10,110	11,929
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	3,421	42,215	80,185	155,418
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	3,421	42,215	80,185	155,436
Brazil [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues				(18)
Myanmar [Member]
Segment Reporting Information [Line Items]
Total revenues	13,700	34,763	15,885	45,660
Myanmar [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	11,730	28,597	8,909	40,170
Myanmar [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1,970	$ 6,166	$ 6,976	$ 5,490