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Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2017
Customer relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	8 years
Customer relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years
Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	5 years
Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	10 years
Product Development Costs
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	4 years

X

- 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://www.xbrl.org/2003/role/presentationRef
-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

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+ References

No definition available.

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