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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Cost $ 173,867 $ 159,405
Accumulated depreciation (124,951) (107,099)
Total 48,916 52,306
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Cost 3,225 3,328
Plant and equipment [Member]    
Property Plant And Equipment [Line Items]    
Cost 43,745 44,063
Instrumentation [Member]    
Property Plant And Equipment [Line Items]    
Cost 71,962 62,282
Furniture and fixtures [Member]    
Property Plant And Equipment [Line Items]    
Cost 8,308 5,711
Computer software [Member]    
Property Plant And Equipment [Line Items]    
Cost 44,720 24,920
Construction in progress [Member]    
Property Plant And Equipment [Line Items]    
Cost $ 1,907 $ 19,101