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Schedule of Intangible Assets Recognized in Connection with Product Acquisitions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]      
Beginning Balance $ 129,160 $ 100,211 $ 107,007
Additions 224 36,667  
Write off (78) (33) (319)
Impact of movement in exchange rates 69 (197) (86)
Amortization expense (7,942) (7,488) (6,391)
Ending Balance $ 121,433 $ 129,160 $ 100,211