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Revolving Credit Facility and Debt - Additional Information (Detail)
€ in Millions
Feb. 05, 2016
USD ($)
Jul. 09, 2014
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2016
EUR (€)
Jan. 30, 2016
USD ($)
Secured Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity under revolving credit facility $ 100,000,000 $ 35,000,000      
Revolving credit facility   $ 25,000,000      
Maturity date Feb. 05, 2021 Sep. 01, 2016      
Undrawn commitment fee, percentage 0.25%        
Secured Revolving Credit Facility [Member] | Commercial Letters of Credit [Member]          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity under revolving credit facility $ 10,000,000        
Secured Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.25%        
Secured Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.25%        
Secured Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 1.75%        
Secured Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Basis spread on variable rate 0.75%        
European Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Revolving credit facility | €       € 10.5  
Outstanding borrowings under revolving lines of credit     $ 0   $ 0
European Revolving Credit Facility [Member] | Commercial Letters of Credit [Member]          
Line of Credit Facility [Line Items]          
Commercial letters of credit outstanding     $ 500,000   $ 0