Property Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 6,927	$ 6,829
Buildings	43,431	32,440
Machinery and equipment	211,784	173,428
Construction in progress	6,024	20,485
Property and Equipment, gross	268,166	233,182
Accumulated depreciation	(62,016)	(50,034)
Property, plant and equipment, net	$ 206,150	$ 183,148