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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 760,923 $ 562,809
Raw materials 33,686 30,346
Work in process 16,173 10,911
Inventories, net $ 810,782 $ 604,066