Goodwill and Other Identifiable Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Expected Amortization Expense [Line Items]
Impairment charge	$ 200,520,000
Accumulated goodwill impairment losses	200,500,000	0
Intangible assets amortization expense	41,900,000	24,500,000	27,300,000
Water & Fluid Solutions
Expected Amortization Expense [Line Items]
Impairment charge	200,500,000
Impairment charges, related to trade names	$ 0	$ 0	$ 11,300,000