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Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 15,076	$ 17,411
Work-in-progress	20,544	29,322
Finished goods	8,201	5,894
Supplies	10,892us-gaap_OtherInventorySupplies	11,502us-gaap_OtherInventorySupplies
Inventories	$ 54,713us-gaap_InventoryNet	$ 64,129us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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