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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Schedule of Inventory [Line Items]      
Raw materials $ 161,853 $ 167,097 $ 181,546
Work-in-process 129,548 108,385 129,396
Finished goods 443,084 330,077 458,987
Other 14,176 13,259 13,931
Inventory, Gross, Total 748,661 618,818 783,860
Adjustment to value inventory at cost on the LIFO method (102,891) (102,891) (95,937)
Inventories $ 645,770 $ 515,927 $ 687,923