Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Apr. 23, 2021	Sep. 30, 2021	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 226,073	$ 213,877	$ 169,379	$ 328,788	$ 618,014
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	189,861	183,156	153,364	281,189	516,992
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	36,212	30,721	16,015	47,599	101,022
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	97,887	89,029	100,263	148,538	295,546
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	70,970	71,954	93,215	122,732	226,425
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	26,917	17,075	7,048	25,806	69,121
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	28,665	38,201	21,728	67,430	82,570
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	24,616	34,671	17,031	58,620	72,475
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	4,049	3,530	4,697	8,810	10,095
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	48,877	29,902		29,894	108,545
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	46,274	23,223		23,223	100,094
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,603	6,679		6,671	8,451
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	28,631	23,847	30,267	37,715	53,913
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	26,111	22,271	27,967	35,186	47,506
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,520	1,576	2,300	2,529	6,407
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	21,564	20,511	3,421	23,735	60,583
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	21,564	20,511	3,421	23,735	60,583
Myanmar [Member]
Segment Reporting Information [Line Items]
Total revenues	449	12,387	13,700	21,476	16,857
Myanmar [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	326	10,526	11,730	17,693	9,909
Myanmar [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 123	$ 1,861	$ 1,970	$ 3,783	$ 6,948