Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Measurement Inputs, Disclosure [Line Items]
Maturity period limit of foreign currency exchange instruments (in months)	1 month
Net fair value gain on foreign exchange forward contracts	$ 1.6	$ 1.0
Difference between carrying amount and fair value of long-term debt	19		15
Other Income Expense Net
Fair Value, Measurement Inputs, Disclosure [Line Items]
Gain on foreign exchange forward contracts	2.4	3.0
Prepaid Expenses and Other Current Assets
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net fair value gain on foreign exchange forward contracts	1.8	1.2
Other Accrued Liabilities
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net fair value gain on foreign exchange forward contracts	0.2	0.2
Foreign Exchange Contract
Fair Value, Measurement Inputs, Disclosure [Line Items]
Notional amount of foreign exchange forward contracts not designated as hedging instruments	$ 486.0	$ 393.3