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Business Segments - Loss from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating loss $ (92,639) $ (95,259)
Other operating income, net [1] 12,904 1,345
Interest income 406 110
Interest expense (8,270) (10,800)
Other 17 16
Loss before income taxes (100,486) (105,933)
Other Operations    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating loss (1,951) (3,231)
Corporate    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating loss (18,995) (14,318)
Operating Segments | Contract Drilling    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating loss (61,706) (35,096)
Operating Segments | Pressure Pumping    
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]    
Operating loss $ (22,891) $ (43,959)
[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.