Notional Amounts of Derivative Financial Instruments and Related Fair Values Measured on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	$ 181.3	$ 191.7
Total derivative financial instruments, fair value (net)	(3.9)	(5.4)
Designated as Hedging Instrument | Interest rate swap contract
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Liability	169.4	180.6
Designated as Hedging Instrument | Interest rate swap contract | Other non-current liabilities
Derivatives, Fair Value [Line Items]
Fair value of Derivative Instruments, Liability	(3.9)	(5.8)
Designated as Hedging Instrument | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Asset	11.9	6.4
Designated as Hedging Instrument | Foreign exchange contracts | Prepaid expenses and other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0.1
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amounts of Derivative Instruments, Asset	0	4.7
Not Designated as Hedging Instrument | Foreign exchange contracts | Prepaid expenses and other [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 0	$ 0.3