Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Inventory Net
Raw materials	$ 27,720		$ 26,385
Work-in-process	10,242		12,258
Finished goods	60,667	[1]	54,688	[1]
Supplies	515		606
Total inventories	$ 99,144		$ 93,937

[1] Includes consignment inventories held by customers for $5,229 and $5,157 at December 31, 2012 and 2011, respectively.