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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (90,009,000) $ (114,566,000) $ (316,946,000) $ (768,060,000)
Credit loss expense 0 0 0 (5,606,000)
Interest income 37,000 238,000 196,000 1,229,000
Interest expense (10,683,000) (11,288,000) (31,396,000) (33,496,000)
Other 14,000 512,000 840,000 682,000
Loss before income taxes (100,641,000) (125,104,000) (347,306,000) (799,645,000)
Corporate        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (18,489,000) (20,163,000) (57,040,000) (75,145,000)
Operating Segments | Contract Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (51,830,000) (47,214,000) (158,680,000) (481,974,000)
Operating Segments | Pressure Pumping        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (13,774,000) (30,856,000) (77,434,000) (134,896,000)
Operating Segments | Directional Drilling        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) (4,581,000) (9,912,000) (14,614,000) (34,892,000)
Other Operations        
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]        
Operating income (loss) $ (1,335,000) $ (6,421,000) $ (9,178,000) $ (35,547,000)