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Inventories - Major Classes of Inventories (Detail) - USD ($)
$ in Thousands
Oct. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 119,754 $ 90,019
Work-in-process 39,672 25,166
Finished goods 130,009 99,784
Gross inventories 289,435 214,969
Excess and obsolete reserves (26,941) (24,561)
Net inventories $ 262,494 $ 190,408