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Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flow Hedging [Member]
Derivative [Line Items]
Period to evaluate and calculate the effectiveness of each hedge	Quarterly
Maturity period of forward contract	Within twelve months
Total notional value of the Company's outstanding forward contracts, designated as foreign-currency cash-flow hedges	$ 39.8	$ 36.9
Other Foreign Currency Hedges [Member]
Derivative [Line Items]
Maturity period of forward contract	Within three months
Total notional value of outstanding forward contracts, not designated as hedges under hedge accounting	31.6	37.6
Gains (losses) on other foreign-currency hedges recognized in interest income and other, net	$ (0.4)	$ (3.1)	$ 2.7

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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