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Inventories, net - Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods and parts $ 92,596 $ 99,773
Work in process 116,336 118,240
Raw materials and purchased parts 412,586 406,554
Total inventories, net $ 621,518 $ 624,567