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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.

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