Business Segments - Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 5,404,056	$ 3,772,291
Other Operations
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		164,200	48,885
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Total assets	[1]	129,551	36,957
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		3,943,899	3,032,819
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Total assets		$ 1,166,406	$ 653,630

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