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Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 164,564 $ 105,917 $ 149,814
Finished goods 727,252 481,604 703,981
Inventories $ 891,816 $ 587,521 $ 853,795