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Business Segments - Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues $ 207,141 $ 598,452 $ 903,448 $ 1,978,388
Contract Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 115,054 317,035 553,552 1,037,565
Pressure Pumping        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 71,973 208,637 256,613 707,246
Directional Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 10,271 47,037 56,498 150,214
Operating Segments | Contract Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 115,105 317,468 554,421 1,038,705
Operating Segments | Pressure Pumping        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 71,973 208,637 256,613 707,246
Operating Segments | Directional Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 10,271 47,037 56,498 150,214
Other Operations        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues [1] 11,756 32,809 46,061 96,052
Intersegment Elimination        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues [2] $ (1,964) $ (7,499) $ (10,145) $ (13,829)
[1] Other operations includes our oilfield rentals business, drilling equipment service business, the electrical controls and automation business and the oil and natural gas working interests.
[2] Intercompany revenues consist of revenues from contract drilling for services provided to our other operations, and revenues from other operations for services provided to contract drilling, pressure pumping and within other operations. These revenues are generally based on estimated external selling prices and are eliminated during consolidation.