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Inventories, net - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods and parts $ 87,370 $ 81,619
Work in process 137,283 102,945
Raw materials and purchased parts 514,035 374,607
Total inventories, net $ 738,688 $ 559,171