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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (38,016) $ (123,409) $ (270,891) $ (343,000)
Other operating income, net [1] 3,791 4,118 18,501 10,285
Interest income 101 63 1,149 273
Interest expense (9,584) (10,244) (26,929) (31,722)
Other 78 19 226 52
Loss before income taxes (47,421) (133,571) (296,445) (374,397)
Other Operations        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (6,516) 228 (13,030) (2,263)
Corporate        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (31,735) (13,400) (119,483) (41,138)
Operating Segments | Contract Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (20,397) (67,786) (155,465) (173,331)
Operating Segments | Pressure Pumping        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ 16,841 $ (46,569) $ (1,414) $ (136,553)
[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.