Pro Forma Consolidated Operating Results (Detail) (La Barge, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
La Barge
Business Acquisition, Pro Forma Information [Line Items]
Net sales	$ 744,366	$ 732,443
Net loss	$ (39,737)	$ (2,309)
Basic loss per share	$ (3.77)	$ (0.22)
Diluted loss per share	$ (3.77)	$ (0.22)