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Long-Term Debt - Additional Information (Detail)
6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Dec. 31, 2015
USD ($)
Aug. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 6,400,000 € 5,800,000 $ 6,300,000  
Amount outstanding under lines of credit $ 0      
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      
Line of credit, leverage ratio       3.0
Line of credit, interest coverage ratio       300.00%