Business Segments - Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 4,178,619	$ 3,772,291
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		48,569	48,885
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	463,752	36,957
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		2,985,997	3,032,819
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 680,301	$ 653,630

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