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Business Segments - Income (Loss) from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss) $ (210,790) $ (80,281) $ (9,004) $ (22,102) $ (21,647) $ (38,016) $ (140,236) $ (92,639) $ (322,177) $ (292,538) $ (456,226)
Other operating income, net [1]                 17,569 31,957 14,323
Interest income                 5,597 1,866 327
Interest expense                 (51,578) (37,472) (40,366)
Other                 750 343 69
Loss before income taxes                 (367,408) (327,801) (496,196)
Other Operations                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 (18,221) (20,813) (3,391)
Corporate                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 (93,585) (152,792) (54,672)
Operating Segments | Contract Drilling                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 (33,115) (171,897) (235,858)
Operating Segments | Pressure Pumping                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 (77,328) 21,028 $ (176,628)
Operating Segments | Directional Drilling                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Operating income (loss)                 $ (117,497) $ (21)  
[1] Other operating income (expense), net includes net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments. This caption also includes expenses related to certain legal-related expenses and settlements, net of insurance reimbursements and certain research and development expenses.