Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 141,065	$ 157,319	$ 437,984	$ 517,201
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,429	1,488	4,423	4,987
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	97,160	102,275	297,426	328,843
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	29,838	37,104	98,963	118,586
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Depreciation and amortization	6,772	9,600	19,863	29,698
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 5,866	$ 6,852	$ 17,309	$ 35,087