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Summary of Segment and Weighted Average Useful Life of Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2018
Customer Relationships | Directional Drilling
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life, Identifiable intangible assets	3 years
Customer Relationships | Other Operations
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life, Identifiable intangible assets	7 years
Developed Technology | Directional Drilling
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life, Identifiable intangible assets	10 years
Favorable Drilling Contracts | Contract Drilling
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life, Identifiable intangible assets	9 months 29 days
Internal Use Software | Directional Drilling
Acquired Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life, Identifiable intangible assets	5 years

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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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