Portion of Fair Value Consideration Transferred Assigned to Identifiable Intangible Assets (Detail) - MS Directional $ in Thousands	Oct. 11, 2017 USD ($)
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
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
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
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

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.

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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