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Fair value measurement - reconciliation of changes in three financial liabilities measured at fair value on recurring (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in Level 3 Financial Liabilities Related to Contingent Consideration [Roll Forward] |  |
Beginning balance | $ 7,102 | $ 20,829
Initial estimate upon acquisition | 261,733 | 0
Payments | (335) | (7,282)
Revaluations | 3,575 | (6,445)
Translation adjustment | 61 | 0
Ending balance | $ 272,136 | $ 7,102

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Foreign Currency Translation Adjustments + References No definition available. + Details
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- Definition Initial Estimate Upon Acquisition + References No definition available. + Details
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- Definition Payment for contingent consideration. + References No definition available. + Details
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- Definition Revaluation of contingent consideration. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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