Drilling and Other Property and Equipment - Summary of Cost and Accumulated Depreciation of Drilling and Other Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment	$ 7,430,480	$ 8,161,045
Less: accumulated depreciation	(3,100,497)	(3,008,217)
Drilling and other property and equipment, net	4,329,983	5,152,828
Drilling Rigs and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	7,273,173	8,004,489
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	64,342	64,267
Office Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 92,965	$ 92,289