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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (307,305) $ (80,281) $ (378,813) $ (111,387)
Other operating (expenses) income, net [1] 252 771 (83) 10,321
Provision for bad debts     (3,594)  
Interest income 1,693 817 4,481 4,600
Interest expense (20,739) (12,376) (47,021) (38,668)
Other 119 281 328 666
Loss before income taxes (326,232) (91,559) (421,025) (144,789)
Corporate        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (23,374) (23,005) (72,010) (70,876)
Operating Segments | Contract Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (169,528) (42,704) (131,817) (60,058)
Operating Segments | Pressure Pumping        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (42,962) (1,487) (76,138) 44,539
Operating Segments | Directional Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (32,501) (8,995) (43,458) (21,586)
Other Operations        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (39,192) $ (4,861) $ (51,713) $ (13,727)
[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.