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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Short-term inventories:
Raw materials	$ 45,624	$ 56,913
Work-in-process	1,187	10,157
Finished goods	60,014	43,374
Supplies	3,120	3,101
Total short-term inventories	109,945	113,545
Long-term inventories:
Finished goods	1,306	1,608
Total inventories	$ 111,251	$ 115,153

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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