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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	$ (114,566)			$ (307,305)	$ (768,060)	$ (378,813)
Credit loss expense		$ (4,551)	$ (1,055)		(5,606)	(3,594)
Interest income	238			1,693	1,229	4,481
Interest expense	(11,288)			(20,739)	(33,496)	(47,021)
Other	512			119	682	328
Loss before income taxes	(125,104)			(326,232)	(799,645)	(421,025)
Corporate
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	(20,163)			(23,122)	(75,145)	(72,093)
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	(47,214)			(169,528)	(481,974)	(131,817)
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	(30,856)			(42,962)	(134,896)	(76,138)
Operating Segments | Directional Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	(9,912)			(32,501)	(34,892)	(43,458)
Other Operations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)	$ (6,421)			$ (39,192)	$ (35,547)	$ (51,713)

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