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Acquisitions - Additional Information (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($) Business
Business Acquisition [Line Items] |
Number of business acquisitions | Business | 2
Acquisitions of intangible assets | $ 25,100
Syngenta AG |
Business Acquisition [Line Items] |
Business acquisition completed date | Aug. 22, 2017
Product Rights |
Business Acquisition [Line Items] |
Business combination, preliminary allocation purchase price of intangible assets | $ 22,000
Trademarks |
Business Acquisition [Line Items] |
Business combination, preliminary allocation purchase price of intangible assets | 1,900
Customer Lists |
Business Acquisition [Line Items] |
Business combination, preliminary allocation purchase price of intangible assets | $ 1,200

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