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Business Segments - Identifiable Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets $ 3,491,225 $ 4,439,615
Corporate    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets [1] 383,121 261,019
Operating Segments | Contract Drilling    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets 2,415,566 3,190,463
Operating Segments | Pressure Pumping    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets 488,456 695,570
Operating Segments | Directional Drilling    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets 111,192 164,273
Other Operations    
Segment Reporting Asset Reconciling Item [Line Items]    
Total assets $ 92,890 $ 128,290
[1] Corporate assets primarily include cash on hand and certain property and equipment.