Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Minimum Building Improvements	Dec. 31, 2012 Minimum Machinery and Equipment	Dec. 31, 2012 Minimum Furniture and Fixtures	Dec. 31, 2012 Maximum Building Improvements	Dec. 31, 2012 Maximum Machinery and Equipment	Dec. 31, 2012 Maximum Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Land	$ 14,643	$ 14,622
Buildings and improvements	45,816	44,402
Machinery and equipment	121,033	107,591
Furniture and equipment	26,181	23,707
Construction in progress	7,142	8,817
Property, Plant and Equipment, Gross, Total	214,815	199,139
Less accumulated depreciation	116,432	100,662
Total	$ 98,383	$ 98,477
Property, Plant and Equipment, Useful Life			5 years	2 years	2 years	40 years	20 years	10 years