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Business Segments - Depreciation, Amortization and Improvement (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 783,341 $ 668,434 $ 864,759
Other Operations      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 29,402 10,114 26,301
Corporate      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 7,695 5,474 5,472
Operating Segments | Contract Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 538,891 467,974 618,434
Operating Segments | Pressure Pumping      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment 198,006 $ 184,872 $ 214,552
Operating Segments | Directional Drilling      
Segment Reporting Information [Line Items]      
Depreciation, depletion, amortization and impairment $ 9,347