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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	$ (124,198,000)	$ (114,566,000)	$ (159,084,000)	$ (494,410,000)	$ (82,763,000)	$ (307,305,000)	$ (48,125,000)	$ (23,383,000)	$ (892,258,000)	$ (461,576,000)	$ (322,177,000)
Credit loss expense			$ (4,551,000)	$ (1,055,000)					(5,606,000)	(5,683,000)	0
Interest income									1,254,000	6,013,000	5,597,000
Interest expense									(40,770,000)	(75,204,000)	(51,578,000)
Other									756,000	389,000	750,000
Loss before income taxes									(931,018,000)	(530,378,000)	(367,408,000)
Corporate
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)									(94,251,000)	(94,414,000)	(76,016,000)
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)									(543,438,000)	(151,329,000)	(33,115,000)
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)									(166,666,000)	(102,701,000)	(77,328,000)
Operating Segments | Directional Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)									(40,612,000)	(52,724,000)	(117,497,000)
Other Operations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)									$ (41,685,000)	$ (54,725,000)	$ (18,221,000)

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