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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (48,125)	$ (9,004)	$ (71,508)	$ (31,106)
Other operating (expenses) income, net	[1]	(9,071)	7,129	(335)	9,550
Provision for bad debts		(3,594)		(3,594)
Interest income		1,756	2,360	2,788	3,783
Interest expense		(13,298)	(12,667)	(26,282)	(26,292)
Other		92	216	209	385
Loss before income taxes		(59,575)	(19,095)	(94,793)	(53,230)
Corporate
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(24,939)	(24,064)	(48,636)	(47,871)
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		16,494	(251)	37,711	(17,354)
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(14,408)	20,637	(33,176)	46,026
Operating Segments | Directional Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(5,290)	(7,678)	(10,957)	(12,591)
Other Operations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (7,317)	$ (4,777)	$ (12,521)	$ (8,866)
[1] Other operating income, net includes net gains associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains have been excluded from the operating results of specific segments. This caption also includes certain legal-related expenses and settlements, net of insurance reimbursements.

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