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Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 21.2 $ 17.3 $ 13.4
Payment for construction to expand building $ 2.2    
Lease expiration year, earliest 2019    
Lease expiration year, latest 2025    
Expected rental income, during 2019 $ 1.3    
Expected rental income, during 2020 1.3    
Expected rental income, during 2021 1.3    
Expected rental income, during 2022 1.4    
Expected rental income, during 2023 1.4    
Expected rental income, thereafter 2.4    
Rental income from third party tenants $ 1.2 1.5 $ 1.7
Latham, New York      
Property, Plant and Equipment [Line Items]      
Payment for construction to expand building   2.1  
Payment to acquire building   2.9  
Yarmouth, Maine      
Property, Plant and Equipment [Line Items]      
Payment for construction to expand building   $ 19.4