Business Segments - Capital Expenditures (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]
Capital expenditures	$ 34,264	$ 13,442	$ 90,837	$ 135,043
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	434	73	1,053	1,377
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	21,239	9,502	56,708	101,448
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	6,468	1,653	19,457	17,880
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Capital expenditures	3,290	510	4,613	4,562
Other Operations
Segment Reporting Information [Line Items]
Capital expenditures	$ 2,833	$ 1,704	$ 9,006	$ 9,776