Restructuring - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Person	Dec. 31, 2011 Person
Restructuring Cost and Reserve [Line Items]
Number of employees	140	210
Water & Fluid Solutions
Restructuring Cost and Reserve [Line Items]
Number of employees	85	160
Technical Products
Restructuring Cost and Reserve [Line Items]
Number of employees	55	50