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Goodwill and Other Intangible Assets (Weighted Average Amortization Period by Intangible Asset Class) (Detail) | 12 Months Ended
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Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |
Weighted average useful life | 8 years 3 months 18 days
Customer relationships |
Acquired Finite-Lived Intangible Assets [Line Items] |
Weighted average useful life | 9 years 7 months 6 days
Technology |
Acquired Finite-Lived Intangible Assets [Line Items] |
Weighted average useful life | 5 years 4 months 24 days
Trademarks and patents |
Acquired Finite-Lived Intangible Assets [Line Items] |
Weighted average useful life | 6 years 6 months
Covenant not to compete |
Acquired Finite-Lived Intangible Assets [Line Items] |
Weighted average useful life | 2 years 6 months

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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. + Details
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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://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 + Details
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