Additions to Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 37.5
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Amount	31.4
Weighted Average Amortization Period	6 years 1 month 6 days
Trade Names
Acquired Finite Lived Intangible Assets [Line Items]
Amount	3.5
Weighted Average Amortization Period	1 year 8 months 12 days
Trademarks, licenses and agreements
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 2.6
Weighted Average Amortization Period	4 years 3 months 18 days