Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 229,170	$ 233,542
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	217,866	226,697
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	11,304	6,845
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	108,044	140,578
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	104,900	138,632
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	3,144	1,946
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	63,179	53,314
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	63,179	53,284
Brazil [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues		30
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	35,844	26,516
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	32,599	24,609
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	3,245	1,907
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	22,103	13,134
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	17,188	10,172
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 4,915	$ 2,962