Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) Gross and Net of Income Tax (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income Loss [Line Items]
Changes in unrealized gains and (losses) on foreign currency hedging activities, Gross	$ (9,936)	$ 8,878	$ (1,522)
Changes in unrealized gains and (losses) on foreign currency hedging activities, Income tax (benefit)	(2,695)	2,669	(573)
Unrealized gain (loss) on hedging transactions, net of income taxes	(7,241)	6,209	(949)
Changes in unrealized gains and (losses) on investments classified as available-for-sale, Gross	1,337	(597)	(652)
Changes in unrealized gains and (losses) on investments classified as available-for-sale, Income tax (benefit)	450	(212)	(246)
Unrealized holding gains (losses) on investments, net of income taxes	887	(385)	(406)
Foreign currency translation adjustment	$ 242	$ (688)	$ 67