Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 244,958	$ 226,073	$ 758,542	$ 618,014
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	224,929	189,861	704,302	516,992
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	20,029	36,212	54,240	101,022
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	132,025	97,887	387,624	295,546
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	123,140	70,970	357,650	226,425
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	8,885	26,917	29,974	69,121
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	32,904	48,877	144,607	108,545
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	29,365	46,274	135,360	100,094
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	3,539	2,603	9,247	8,451
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	41,046	28,631	124,241	53,913
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	36,207	26,111	113,750	47,506
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	4,839	2,520	10,491	6,407
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	18,982	21,564	60,710	60,583
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	18,982	21,564	60,710	60,583
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	20,001	28,665	41,360	82,570
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	17,235	24,616	36,832	72,475
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 2,766	4,049	$ 4,528	10,095
Myanmar [Member]
Segment Reporting Information [Line Items]
Total revenues		449		16,857
Myanmar [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues		326		9,909
Myanmar [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues		$ 123		$ 6,948