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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) $ (22,102) $ (92,639)
Other operating income, net [1] 2,421 12,904
Interest income 1,423 406
Interest expense (13,625) (8,270)
Other 169 17
Loss before income taxes (34,135) (100,486)
Other Operations    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) (4,089) (1,951)
Corporate    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) (23,807) (18,995)
Operating Segments | Contract Drilling    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) (17,103) (61,706)
Operating Segments | Pressure Pumping    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) 25,389 $ (22,891)
Operating Segments | Directional Drilling    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating income (loss) $ (4,913)  
[1] Other operating income 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 expenses related to certain legal settlements net of insurance reimbursements.