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.

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+ References

No definition available.

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Portion of Fair Value Consideration Transferred Assigned to Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Oct. 11, 2017	Apr. 20, 2017
Seventy Seven Energy Inc.
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred		$ 22,500
Seventy Seven Energy Inc. \| Favorable Drilling Contracts
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred		$ 22,500
Weighted Average Useful Life, Identifiable intangible assets		9 months 29 days
MS Directional
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred	$ 74,682
Weighted Average Useful Life, Identifiable intangible assets	7 years 6 months 3 days
MS Directional \| Developed Technology
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred	$ 48,000
Weighted Average Useful Life, Identifiable intangible assets	10 years
MS Directional \| Customer Relationships
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred	$ 26,200
Weighted Average Useful Life, Identifiable intangible assets	3 years
MS Directional \| Internal Use Software
Business Acquisition [Line Items]
Fair Value, Assets, Portion of the fair value consideration transferred	$ 482
Weighted Average Useful Life, Identifiable intangible assets	5 years