Notional Amounts of Derivative Financial Instruments and Related Fair Values Measured on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Total derivative financial instruments, notional amounts	$ 296.1	$ 338.0
Total derivative financial instruments, fair value (net)	(5.6)	(6.4)
Designated as Hedging Instrument | Interest rate swap contract
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Liability	186.3	186.3
Designated as Hedging Instrument | Interest rate swap contract | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Fair value of Derivative Instruments, Liability	5.3	4.6
Not Designated as Hedging Instrument | Interest rate swap contract
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Liability	100.0	140.0
Not Designated as Hedging Instrument | Interest rate swap contract | Accrued expense
Derivatives, Fair Value [Line Items]
Fair value of Derivative Instruments, Liability	0.4	0.8
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Liability		11.7
Notional Amounts of Derivative Instruments, Asset	9.8
Not Designated as Hedging Instrument | Foreign exchange contracts | Accrued expense
Derivatives, Fair Value [Line Items]
Fair value of Derivative Instruments, Liability		1.0
Not Designated as Hedging Instrument | Foreign exchange contracts | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Fair value of Derivative Instruments, Asset	$ 0.1