Drilling and Other Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Impairment charge of assets	$ 197,027	$ 774,028
Drilling and other property and equipment, net of accumulated depreciation	3,900,414		$ 4,122,809
Gain (loss) on disposition of assets	5,401	$ 3,433
Ocean Valor [Member]
Property, Plant and Equipment [Line Items]
Drilling and other property and equipment, net of accumulated depreciation	1,000
Ocean America and Ocean Rover [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of assets	$ 4,400