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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Inventory Disclosure [Abstract]      
Raw materials and work in process $ 130,895 $ 112,327 $ 137,385
Finished goods 859,100 501,471 773,161
Inventories $ 989,995 $ 613,798 $ 910,546