Inventories - Additional Information (Detail) - USD ($) $ in Millions	Jul. 04, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials and supplies in inventory, percentage	37.00%	40.00%
Finished and semi-finished products in inventory, percentage	63.00%	60.00%
Inventories valued using the last-in, first-out	45.00%	43.00%
Increased value of inventory if FIFO method had been used	$ 455.4	$ 567.4
Lower of cost or market adjustments	$ 4.3	$ 2.7