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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]        
Beginning Balance     $ 12,819  
Additions-Other     85  
Net foreign currency translation     14  
Amortization expense $ (1,120) $ (1,129) (2,256) $ (2,249)
Ending Balance 10,662   10,662  
Capitalized Technology [Member]        
Finite-Lived Intangible Assets [Line Items]        
Beginning Balance     10,216  
Additions-Other     0  
Net foreign currency translation     10  
Amortization expense     (2,042)  
Ending Balance 8,184   8,184  
Patents and Trademarks [Member]        
Finite-Lived Intangible Assets [Line Items]        
Beginning Balance     1,929  
Additions-Other     85  
Net foreign currency translation     (1)  
Amortization expense     (92)  
Ending Balance 1,921   1,921  
Other [Member]        
Finite-Lived Intangible Assets [Line Items]        
Beginning Balance     674  
Additions-Other     0  
Net foreign currency translation     5  
Amortization expense     (122)  
Ending Balance $ 557   $ 557