Schedule of Restructuring Charges by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended		33 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ 1,460	[1]	$ 2,625	[1]	$ 15,805	[1]	$ 6,588	[1]	$ 8,584	$ 2,196	$ 26,585
Industrial Products Group
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)					12,593				6,621	3,687	22,901
Engineered Products Group
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)					$ 3,212				$ 1,963	$ (1,491)	$ 3,684

[1] See Note 3 "Restructuring."