Net Gains or Losses Recorded in Accumulated Other Comprehensive Income Relating to Foreign Exchange Contracts Designated as Net Investment Hedges (Detail) (Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Designated as Hedging Instrument
Derivative [Line Items]
Gains(losses)recognized in Other Comprehensive Income(Loss)	$ 1,061	$ (2,401)	$ (1,234)	$ (1,260)