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Summary of Segment and Weighted Average Useful Life of Intangible Assets (Detail) | 12 Months Ended
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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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 + Details
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