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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 436,953 $ 528,935
Work in process 289,307 163,830
Finished goods 754,828 476,512
Service parts 128,519 108,561
Total $ 1,609,607 $ 1,277,838