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Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 916,318 $ 783,341 $ 668,434
Other Operations      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 41,512 29,402 10,114
Corporate      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 7,872 7,695 5,474
Operating Segments | Contract Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 571,607 538,891 467,974
Operating Segments | Pressure Pumping      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 250,010 198,006 $ 184,872
Operating Segments | Directional Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 45,317 $ 9,347