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Fair value measurement - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Maximum amount of undiscounted payments under contingent consideration arrangements | 401.8

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- Definition For contingent consideration arrangements recognized in connection with a business combination, if the maximum (undiscounted) potential outcome is limitless, this element represents a statement of that fact. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration