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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | $ (124,198,000) | $ (114,566,000) | $ (159,084,000) | $ (494,410,000) | $ (82,763,000) | $ (307,305,000) | $ (48,125,000) | $ (23,383,000) | $ (892,258,000) | $ (461,576,000) | $ (322,177,000)
Credit loss expense |  |  | $ (4,551,000) | $ (1,055,000) |  |  |  |  | (5,606,000) | (5,683,000) | 0
Interest income |  |  |  |  |  |  |  |  | 1,254,000 | 6,013,000 | 5,597,000
Interest expense |  |  |  |  |  |  |  |  | (40,770,000) | (75,204,000) | (51,578,000)
Other |  |  |  |  |  |  |  |  | 756,000 | 389,000 | 750,000
Loss before income taxes |  |  |  |  |  |  |  |  | (931,018,000) | (530,378,000) | (367,408,000)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (94,251,000) | (94,414,000) | (76,016,000)
Operating Segments | Contract Drilling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (543,438,000) | (151,329,000) | (33,115,000)
Operating Segments | Pressure Pumping |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (166,666,000) | (102,701,000) | (77,328,000)
Operating Segments | Directional Drilling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (40,612,000) | (52,724,000) | (117,497,000)
Other Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | $ (41,685,000) | $ (54,725,000) | $ (18,221,000)

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