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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 649,880 $ 532,606
Raw materials 24,329 21,278
Work in process 9,446 10,375
Inventories, net $ 683,655 $ 564,259