Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 3,171,842	$ 3,299,069
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	281,691	300,566
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		2,239,587	2,315,318
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		458,128	486,702
Operating Segments | Directional Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		103,677	107,807
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 88,759	$ 88,676

[1] Corporate assets primarily include cash on hand and certain property and equipment.