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Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 126,511 $ 105,917 $ 132,307
Finished goods 571,805 481,604 508,013
Inventories $ 698,316 $ 587,521 $ 640,320