Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 3,017,463	$ 3,299,069
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	252,510	300,566
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		2,099,859	2,315,318
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		474,013	486,702
Operating Segments | Directional Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		105,368	107,807
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 85,713	$ 88,676

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