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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Inventory [Line Items]      
Raw materials and work in process $ 126,261 $ 88,395 $ 125,536
Finished goods 744,524 473,360 698,734
Inventories $ 870,785 $ 561,755 $ 824,270