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Inventories - Inventory, Net of Reserves (Detail) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 31, 2019
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Raw materials $ 134,527 $ 126,850
Work in progress 20,183 15,457
Finished goods 172,236 178,244
Total inventories $ 326,946 $ 320,551