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Inventories - Inventory, Net of Reserves (Detail) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 31, 2018
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Raw materials $ 126,326 $ 111,641
Work in progress 20,705 15,552
Finished goods 221,759 164,376
Total inventories $ 368,790 $ 291,569