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Components of Inventory Net of Reserves (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw material $ 95,224 $ 86,243
Work in process 5,296 3,877
Finished goods 557,361 461,421
Total inventories, net $ 657,881 $ 551,541