Schedule of Other Expense or Income Net (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
Components of Other Income (Expense)
Interest income	$ 487		$ 589		$ 1,012		$ 1,126
Interest expense	(1,129)		(790)		(2,260)		(1,769)
Foreign currency (losses) gains, net	(2,643)	[1]	1,195	[1]	(1,086)	[1]	4,297	[1]
Foreign currency contracts gains (losses), net	1,338	[2]	(881)	[2]	(405)	[2]	(2,493)	[2]
Other (expense) income	(453)		9		(535)		118
Total other (expense) income, net	$ (2,400)		$ 122		$ (3,274)		$ 1,279

[1] Our foreign currency gains (losses), net are predominantly attributable to the re-measurement gains or losses on our net balances of monetary assets and liabilities in our foreign subsidiaries which were primarily denominated in the Euro, and to a lesser extent, the British Pound and Canadian Dollar. The foreign currency re-measurement adjustments to these balance sheet items are calculated by comparing the currency spot rates at the end of a month to the spot rates at the end of the previous month.

[2] Relates to changes in fair value of our forward foreign currency contracts not designated as hedging instruments. See Note 15 - Derivative Instruments for further details.