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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (9,004)	$ (140,236)	$ (31,106)	$ (232,875)
Other operating income, net	[1]	7,129	1,806	9,550	14,710
Interest income		2,360	642	3,783	1,048
Interest expense		(12,667)	(9,075)	(26,292)	(17,345)
Other		216	131	385	148
Loss before income taxes		(19,095)	(148,538)	(53,230)	(249,024)
Other Operations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(4,777)	(4,563)	(8,866)	(6,514)
Corporate
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(24,064)	(68,753)	(47,871)	(87,748)
Operating Segments | Contract Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		(251)	(73,362)	(17,354)	(135,068)
Operating Segments | Pressure Pumping
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		20,637	$ 4,636	46,026	$ (18,255)
Operating Segments | Directional Drilling
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Operating income (loss)		$ (7,678)		$ (12,591)
[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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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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