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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Inventories [Line Items]    
Inventories $ 97,205 $ 77,407
Gross carrying amount [Member]    
Disclosure Of Inventories [Line Items]    
Raw materials and supplies 32,278 24,382
Work in progress 14,240 12,057
Finished goods 39,460 31,489
Distributed products 13,591 11,130
Inventories 99,569 79,058
Accumulated impairment [Member]    
Disclosure Of Inventories [Line Items]    
Inventories $ (2,364) $ (1,651)