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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     $ 46,549    
Additions     40    
Net foreign currency translation     22    
Amortization expense $ (2,201) $ (2,202) (4,399) $ (4,427)  
Ending Balance 42,212   42,212    
June 30, 2017 balance at cost         $ 79,436
Accumulated amortization         (37,224)
Ending Balance 42,212   42,212   42,212
Capitalized Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     11,392    
Additions     0    
Net foreign currency translation     12    
Amortization expense     (2,230)    
Ending Balance 9,174   9,174    
June 30, 2017 balance at cost         38,337
Accumulated amortization         (29,163)
Ending Balance 9,174   9,174   9,174
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     24,774    
Additions     0    
Net foreign currency translation     10    
Amortization expense     (1,039)    
Ending Balance 23,745   23,745    
June 30, 2017 balance at cost         27,802
Accumulated amortization         (4,057)
Ending Balance 23,745   23,745   23,745
Other [Member]          
Finite-Lived Intangible Assets [Line Items]          
Beginning Balance     10,383    
Additions     40    
Net foreign currency translation     0    
Amortization expense     (1,130)    
Ending Balance 9,293   9,293    
June 30, 2017 balance at cost         13,297
Accumulated amortization         (4,004)
Ending Balance $ 9,293   $ 9,293   $ 9,293