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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basis Of Consolidation And Presentation [Line Items]
Adjustment of loss before income tax	$ (326,232)	$ (91,559)	$ (421,025)	$ (144,789)
Contract Drilling
Basis Of Consolidation And Presentation [Line Items]
Adjustment of loss before income tax	$ (14,500)		$ (6,600)

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Basis of consolidation and presentation line Items.

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