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Inventory, Net - Components of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and purchased parts, net $ 46,484 $ 38,192
Work in process, net 5,322 5,360
Finished goods, net 19,719 14,472
Inventory, net $ 71,525 $ 58,024