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Business Segments - Capital Expenditures (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Capital expenditures	$ 567,087	$ 119,799	$ 743,776
Other Operations
Segment Reporting Information [Line Items]
Capital expenditures	31,547	6,116	16,625
Corporate
Segment Reporting Information [Line Items]
Capital expenditures	1,884	1,591	2,520
Operating Segments | Contract Drilling
Segment Reporting Information [Line Items]
Capital expenditures	354,425	72,508	527,054
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Capital expenditures	171,436	$ 39,584	$ 197,577
Operating Segments | Directional Drilling
Segment Reporting Information [Line Items]
Capital expenditures	$ 7,795

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

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+ References

No definition available.

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