Net Gains or Losses Recorded in Accumulated Other Comprehensive Income Relating to Foreign Exchange Contracts Designated as Net Investment Hedges (Detail) (Dedesignated As Hedging Instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Dedesignated As Hedging Instrument
Derivative [Line Items]
Gains (losses) recognized in Other Comprehensive Income (Loss)	$ 90	$ 1,181