Goodwill and Other Intangible Assets (Additions to Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Goodwill And Other Intangible Assets [Line Items]
Amount	$ 24.2
Customer relationships [Member]
Goodwill And Other Intangible Assets [Line Items]
Amount	20.2
Weighted Average Amortization Period	6 years 3 months 18 days
Trade names [Member]
Goodwill And Other Intangible Assets [Line Items]
Amount	3.1
Weighted Average Amortization Period	1 year 4 months 24 days
Trademarks, licenses and agreements [Member]
Goodwill And Other Intangible Assets [Line Items]
Amount	$ 0.9
Weighted Average Amortization Period	3 years 3 months 24 days