Business Segments - Depreciation, Depletion, Amortization and Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 144,037	$ 173,085	$ 296,919	$ 359,882
Corporate
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	1,492	1,491	2,994	3,499
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	98,592	115,130	200,266	226,568
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Depreciation, amortization and impairment	31,740	38,811	69,125	81,482
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Depreciation and amortization	6,594	9,677	13,091	20,098
Other Operations
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and impairment	$ 5,619	$ 7,976	$ 11,443	$ 28,235