Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 214,410	$ 209,892
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,803	2,237
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	130,317	130,917
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	60,135	56,522
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	10,367	10,902
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 11,788	$ 9,314