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Inventories - Inventory, Net of Reserves (Detail) - USD ($)
$ in Thousands
Mar. 30, 2019
Dec. 31, 2018
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Raw materials $ 119,101 $ 111,641
Work in progress 18,314 15,552
Finished goods 195,893 164,376
Total inventories $ 333,308 $ 291,569