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Business Segments - Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets $ 5,758,856 $ 3,772,291 $ 4,465,048
Other Operations      
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets 172,094 48,885 38,726
Corporate      
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets [1] 144,069 36,957 155,574
Operating Segments | Contract Drilling      
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets 3,931,994 3,032,819 3,457,044
Operating Segments | Pressure Pumping      
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets 1,209,424 $ 653,630 $ 813,704
Operating Segments | Directional Drilling      
Segment Reporting Asset Reconciling Item [Line Items]      
Total assets $ 301,275    
[1] Corporate assets primarily include cash on hand, income tax receivables, certain property and equipment, and certain deferred tax assets.