Restructuring Expenses - Restructuring Expenses by Reportable Segment (Detail) - Operating Segments $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 6,500
Contract termination costs	20,373
Other exit costs	1,544
Right-of-use asset abandonments	9,921
Total	38,338
Contract Drilling
Restructuring Cost And Reserve [Line Items]
Severance costs	1,821
Other exit costs	523
Right-of-use asset abandonments	86
Total	2,430
Pressure Pumping
Restructuring Cost And Reserve [Line Items]
Severance costs	3,460
Contract termination costs	20,373
Other exit costs	194
Right-of-use asset abandonments	7,304
Total	31,331
Directional Drilling
Restructuring Cost And Reserve [Line Items]
Severance costs	503
Other exit costs	827
Right-of-use asset abandonments	1,845
Total	3,175
Other Operation
Restructuring Cost And Reserve [Line Items]
Severance costs	501
Total	501
Corporate Segment
Restructuring Cost And Reserve [Line Items]
Severance costs	215
Right-of-use asset abandonments	686
Total	$ 901