Business Segments - Capital Expenditures (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]
Capital expenditures	$ 38,050	$ 49,673	$ 56,573	$ 121,601
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	439	373	619	1,304
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	24,042	42,501	35,469	91,946
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	8,921	1,947	12,989	16,227
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Capital expenditures	1,219	2,044	1,323	4,052
Other Operations
Segment Reporting Information [Line Items]
Capital expenditures	$ 3,429	$ 2,808	$ 6,173	$ 8,072