Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 122,921	$ 68,440
Other Operations
Segment Reporting Information [Line Items]
Capital expenditures	9,396	4,352
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	526	454
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	75,247	44,221
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	24,923	$ 19,413
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Capital expenditures	$ 12,829