Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventory [Line Items]
Raw materials and supplies	$ 19,598	$ 22,237
In-process inventories	5,039	2,655
Finished goods and goods for resale	152,973	95,105
Reserve for stock obsolescence	(2,896)	(2,307)
Total	$ 174,714	$ 117,690