Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 274,610	$ 232,021
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	258,770	214,383
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	15,840	17,638
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	153,803	117,138
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	146,475	104,581
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	7,328	12,557
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	36,801	18,762
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	32,568	17,702
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	4,233	1,060
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	29,823	20,149
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	27,360	19,309
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,463	840
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	26,570	20,660
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	26,570	20,660
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	27,613	55,312
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	25,797	52,131
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1,816	$ 3,181