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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     $ 37,970    
Net foreign currency translation     (72)    
Amortization expense $ (2,203) $ (1,120) (4,427) $ (2,256)  
Ending Balance 33,471   33,471    
June 30, 2016 balance at cost         $ 61,633
Accumulated amortization         (28,162)
Ending Balance 33,471   33,471   33,471
Other Acquisitions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Additions     14    
Disposals     (14)    
Capitalized Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     34,632    
Net foreign currency translation     (35)    
Amortization expense     (4,164)    
Ending Balance 30,433   30,433    
June 30, 2016 balance at cost         57,095
Accumulated amortization         (26,662)
Ending Balance 30,433   30,433   30,433
Capitalized Technology [Member] | Other Acquisitions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Additions     0    
Disposals     0    
Patents and Trademarks [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     2,214    
Net foreign currency translation     0    
Amortization expense     (106)    
Ending Balance 2,108   2,108    
June 30, 2016 balance at cost         2,856
Accumulated amortization         (748)
Ending Balance 2,108   2,108   2,108
Patents and Trademarks [Member] | Other Acquisitions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Additions     14    
Disposals     (14)    
Other [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     1,124    
Net foreign currency translation     (37)    
Amortization expense     (157)    
Ending Balance 930   930    
June 30, 2016 balance at cost         1,682
Accumulated amortization         (752)
Ending Balance $ 930   930   $ 930
Other [Member] | Other Acquisitions [Member]          
Finite-Lived Intangible Assets [Line Items]          
Additions     0    
Disposals     $ 0