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Business Segments - Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) $ (159,084)   $ (48,125) $ (653,494) $ (71,508)
Credit loss expense (4,551) $ (1,055) (3,594) (5,606) (3,594)
Interest income 334   1,756 991 2,788
Interest expense (10,984)   (13,298) (22,208) (26,282)
Other 85   92 170 209
Loss before income taxes (169,649)   (59,575) (674,541) (94,793)
Corporate          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) (30,497)   (34,010) (54,982) (48,971)
Operating Segments | Contract Drilling          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) (30,742)   16,494 (434,760) 37,711
Operating Segments | Pressure Pumping          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) (68,554)   (14,408) (104,040) (33,176)
Operating Segments | Directional Drilling          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) (14,385)   (5,290) (24,980) (10,957)
Other Operations          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Operating income (loss) $ (10,355)   $ (7,317) $ (29,126) $ (12,521)