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Long-Term Debt - Additional Information (Detail)
6 Months Ended
Aug. 30, 2010
USD ($)
Jun. 30, 2015
USD ($)
Jan. 15, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
EUR (€)
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 6,500,000   $ 7,000,000 € 5,800,000
Available capacity under the revolving credit facility     $ 100,000,000    
Amount outstanding under lines of credit   0      
Amount of restricted net assets   $ 187,800,000   181,800,000  
Restricted cash       34,424,000  
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument term (in years)   5 years      
Maximum borrowing capacity $ 200,000,000        
Amount outstanding under lines of credit   $ 0   0  
Revolving credit facility due date   Aug. 30, 2015      
Term Loan Facility [Member]          
Debt Instrument [Line Items]          
Debt instrument term (in years)   5 years      
Maximum borrowing capacity $ 100,000,000        
Amount outstanding under lines of credit   $ 0   $ 0