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Long-Term Debt - Additional Information (Detail) - 6 months ended Jun. 30, 2017
USD ($)
EUR (€)
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 6,600,000 € 5,800,000
Amount outstanding under lines of credit $ 0  
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