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Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 134,709 | $ 125,909
Work in process | 9,680 | 8,287
Finished goods | 78,533 | 78,788
Supplies and materials | 113,973 | 119,284
Inventories at FIFO or average cost | 336,895 | 332,268
Excess of FIFO or average cost over LIFO cost | (70,003) | (63,501)
Inventories, net | $ 266,892 | $ 268,767

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