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Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Indefinite-lived Intangible Assets [Line Items]        
Beginning Balance     $ 16,733  
Additions     680  
Net foreign currency translation     (24)  
Amortization expense (1,143) (1,114) (3,392) (2,207)
Ending Balance 13,997   13,997  
Capitalized Technology [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Beginning Balance     13,776  
Additions     531  
Net foreign currency translation     (15)  
Amortization expense     (3,030)  
Ending Balance 11,262   11,262  
Patents and Trademarks [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Beginning Balance     1,961  
Additions     149  
Net foreign currency translation     (1)  
Amortization expense     (148)  
Ending Balance 1,961   1,961  
Other [Member]
        
Indefinite-lived Intangible Assets [Line Items]        
Beginning Balance     996  
Additions     0  
Net foreign currency translation     (8)  
Amortization expense     (214)  
Ending Balance $ 774   $ 774