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INVENTORIES (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Raw material $ 220,948 $ 191,855
Work-in-process 76,027 73,937
Finished goods and component parts 147,256 114,307
Inventoried costs related to U.S. Government and other long-term contracts 56,226 65,150
Gross inventories 500,457 445,249
Less: Inventory reserves 56,425 54,638
Progress payments applied, principally related to long-term contracts (14,765) (11,745)
Inventories, net $ 429,267 $ 378,866