Hedging Activities and Fair Value Measurements - Additional Information (Detail) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2012 USD ($) Y	Sep. 30, 2012 EUR (€)	Dec. 31, 2011 EUR (€)	Sep. 30, 2012 Minimum	Sep. 30, 2012 Maximum
Derivatives, Fair Value [Line Items]
Borrowings resulting in interest rate risk	$ 440.0
Foreign currency contracts maturity period, years	1	1
Variable rate borrowings	200.0
Variable interest rate, lower range	0.30%	0.30%
Variable interest rate, higher range	2.20%	2.20%
Expiration dates				2013	2014
Expected reclassification of losses out of AOCI into earnings during the next 12 months	0.6
Variable rate borrowings outstanding	388.2	30.0
Number of foreign currency forward contracts outstanding	21	21
Notional amounts, lower range	0.1
Notional amounts, higher range	16.8
Portion of EURO Term Loan designated as net investment hedge		€ 30.0	€ 37.6