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Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Inventory [Line Items] |  |
Raw materials | $ 124,937 | $ 125,909
Work in process | 8,120 | 8,287
Finished goods | 82,256 | 78,788
Supplies and materials | 116,876 | 119,284
Inventories at FIFO or average cost | 332,189 | 332,268
Excess of FIFO or average cost over LIFO cost | (69,181) | (63,501)
Inventories, net | $ 263,008 | $ 268,767

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