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Long-Term Debt - Additional Information (Detail)
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Aug. 31, 2015
USD ($)
Italy [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 6,800,000 € 5,800,000  
Amount outstanding under lines of credit $ 0    
2015 Credit Agreement [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument term (in years) 5 years    
Maximum borrowing capacity     $ 125,000,000
Amount outstanding under lines of credit $ 0