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Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 233,410 $ 179,451
Work-in-process 124,396 121,331
Finished goods 433,937 355,072
Other 12,370 15,528
Inventory, Gross, Total 804,113 671,382
Adjustment to value inventory at cost on the LIFO method (82,823) (68,419)
Inventories $ 721,290 $ 602,963