Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 232,021	$ 186,239
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	214,383	150,252
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	17,638	35,987
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	117,138	102,522
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	104,581	76,283
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	12,557	26,239
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	20,149	18,301
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	19,309	15,697
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	840	2,604
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	55,312	28,862
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	52,131	27,116
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	3,181	1,746
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	18,762	3,734
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	17,702	2,306
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	1,060	1,428
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	20,660	19,266
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 20,660	19,266
Myanmar [Member]
Segment Reporting Information [Line Items]
Total revenues		13,554
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		$ 3,970