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Quantitative Information Associated With Fair Value Measurement of Level 3 Financial Instrument (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 11, 2015
Universal Robots |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent consideration |  |  | $ 31,600
Significant Unobservable Inputs (Level 3) | Universal Robots |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent consideration | [1] | $ 24,497 |
Monte Carlo Simulation | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Contingent consideration |  | $ 20,605 |
Monte Carlo Simulation | Revenue for the period July 1, 2015-December 31, 2017 | Universal Robots |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Target achievement, volatility |  | 11.20% |
Discount Rate |  | 3.30% |
[1] | Contingent consideration of $24.5 million is expected to be paid in March 2018.

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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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