Business Segments - Identifiable Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 3,624,805	$ 4,439,615
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	329,586	261,019
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		2,550,551	3,190,463
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		522,102	695,570
Operating Segments | Directional Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		122,613	164,273
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 99,953	$ 128,290

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