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Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 121,746 $ 112,327 $ 126,511
Finished goods 648,053 501,471 571,805
Inventories $ 769,799 $ 613,798 $ 698,316