Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 281,563	$ 205,702	$ 513,584	$ 391,941
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	264,990	176,879	479,373	327,131
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	16,573	28,823	34,211	64,810
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	138,460	95,135	255,599	197,656
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	129,929	79,171	234,510	155,453
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	8,531	15,964	21,089	42,203
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	56,391	30,807	111,703	59,669
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	53,864	26,704	105,995	53,820
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,527	4,103	5,708	5,849
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	64,433	21,548	83,195	25,282
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	59,841	19,089	77,543	21,395
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	4,592	2,459	5,652	3,887
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	21,068	19,753	41,728	39,019
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	21,068	19,753	41,728	39,019
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	1,211	35,604	21,359	53,906
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	288	32,162	19,597	47,860
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 923	3,442	$ 1,762	6,046
Myanmar [Member]
Segment Reporting Information [Line Items]
Total revenues		2,855		16,409
Myanmar [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues				9,584
Myanmar [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues		$ 2,855		$ 6,825