Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 281,652	$ 196,642	$ 703,928	$ 572,187
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	10,545	9,534	29,688	19,826
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,879	2,231	5,997	5,456
Operating Segments \| Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	179,979	133,603	441,834	405,576
Operating Segments \| Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	76,986	$ 51,274	191,370	$ 141,329
Operating Segments \| Directional Drilling
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 12,263		$ 35,039