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Business Segments - Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues $ 598,452 $ 867,478 $ 1,978,388 $ 2,531,060
Contract Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 317,035 365,280 1,037,565 1,043,005
Pressure Pumping        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 208,637 421,606 707,246 1,253,693
Directional Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 47,037 51,556 150,214 152,877
Operating Segments | Contract Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 317,468 365,697 1,038,705 1,044,190
Operating Segments | Pressure Pumping        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 208,637 421,606 707,246 1,253,693
Operating Segments | Directional Drilling        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues 47,037 51,556 150,214 152,877
Other Operations        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues [1] 32,809 33,087 96,052 94,457
Intersegment Elimination        
Segment Reporting Revenue Reconciling Item [Line Items]        
Total revenues [2] $ (7,499) $ (4,468) $ (13,829) $ (14,157)
[1] Other operations includes the Company’s oilfield rentals business, drilling equipment service business, the electrical controls and automation business, the oil and natural gas working interests and Middle East organizational activities.
[2] Intercompany revenues consists of contract drilling and revenues from other operations for services provided to contract drilling, pressure pumping and within other operations.