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Intangible Assets and Goodwill - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Finite Lived Intangible Assets [Line Items]  
Product acquisition and licensing agreements obligation, Other Liability $ 3,866
Product Registrations  
Finite Lived Intangible Assets [Line Items]  
Expected useful life 25 years
Trademarks  
Finite Lived Intangible Assets [Line Items]  
Expected useful life 25 years
Customer Lists  
Finite Lived Intangible Assets [Line Items]  
Expected useful life 10 years