Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Capital expenditures	$ 118,350	$ 30,533	$ 186,790	$ 51,834
Other Operations
Segment Reporting Information [Line Items]
Capital expenditures	8,017	1,692	12,369	3,220
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	227	491	681	832
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	71,326	16,570	115,547	28,450
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	$ 38,780	$ 11,780	$ 58,193	$ 19,332