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Inventory - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 1,095,888 $ 931,828
Work in process 334,641 296,991
Finished goods 1,600,214 1,581,763
Service parts 351,615 302,864
Total $ 3,382,358 $ 3,113,446