Gains and Losses on Forward Currency Contracts Outstanding and Total Net Foreign Currency Gains and Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Schedule of Foreign Currency Balance [Line Items]
Foreign currency forward contracts gains (losses)	$ (25)		$ (1,586)		$ (54)		$ (2,005)
Total net foreign currency gains (losses)	$ 379	[1]	$ (1,344)	[1]	$ (1,151)	[1]	$ (2,589)	[1]

[1] See Note 13 "Supplemental Information"