Restructuring -Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Person	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Number of employees	210
Total restructuring costs	$ 13,000	$ 17,240
Water & Fluid Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees	160
Total restructuring costs	11,000
Technical Products
Restructuring Cost and Reserve [Line Items]
Number of employees	50
Total restructuring costs	$ 2,000