Business Segments - Revenues (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		$ 291,774	$ 250,380	$ 532,703	$ 696,307
Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		141,732	171,134	275,233	438,498
Pressure Pumping
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		111,991	59,533	187,830	184,640
Directional Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		24,869	11,742	44,539	46,227
Operating Segments | Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		142,264	171,476	275,926	439,316
Operating Segments | Pressure Pumping
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		111,991	59,533	187,830	184,640
Operating Segments | Directional Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues		24,869	11,742	44,539	46,227
Other Operations
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues	[1]	18,251	11,460	32,817	34,305
Intersegment Elimination | Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues	[2]	(532)	(342)	(693)	(818)
Intersegment Elimination | Other Operations
Segment Reporting Revenue Reconciling Item [Line Items]
Total revenues	[2]	$ (5,069)	$ (3,489)	$ (7,716)	$ (7,363)

[1] Other operations includes our oilfield rentals business, drilling equipment service business, the electrical controls and automation business and the oil and natural gas working interests.

[2] Intercompany revenues consist of revenues from contract drilling for services provided to our other operations, and revenues from other operations for services provided to contract drilling, pressure pumping and within other operations. These revenues are generally based on estimated external selling prices and are eliminated during consolidation.