Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013 Cash-Flow Hedges [Member]	Jun. 30, 2013 Cash-Flow Hedges [Member] Designated as hedging instrument [Member]	Dec. 31, 2012 Cash-Flow Hedges [Member] Designated as hedging instrument [Member]	Jun. 30, 2013 Other Foreign-Currency Hedges [Member]	Jul. 01, 2012 Other Foreign-Currency Hedges [Member]	Jun. 30, 2013 Other Foreign-Currency Hedges [Member]	Jul. 01, 2012 Other Foreign-Currency Hedges [Member]	Jun. 30, 2013 Other Foreign-Currency Hedges [Member] Not designated as hedging instrument [Member]	Dec. 31, 2012 Other Foreign-Currency Hedges [Member] Not designated as hedging instrument [Member]
Derivative [Line Items]
Period to evaluate and calculate the effectiveness of each hedge	Quarterly
Maturity period of forward contract	Within twelve months			Within three months
Total notional value of the Company's outstanding forward contracts		$ 40.9	$ 39.8					$ 60.0	$ 31.6
Losses on other foreign-currency hedges recognized in interest income and other, net				$ 2.5	$ 2.9	$ 3.7	$ 1.7