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Inventories, net - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods and parts $ 89,242 $ 81,619
Work in process 119,865 102,945
Raw materials and purchased parts 395,214 374,607
Total inventories, net $ 604,321 $ 559,171