Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	$ 12,238
Reclassification to the income statement	(694)
Change in fair value	7,217
Balance as of December 31, 2013	18,761
Cash Flow Hedging | Foreign currency contracts
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	(1,431)
Reclassification to the income statement	(694)
Change in fair value	2,304
Balance as of December 31, 2013	179
Foreign Currency Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	13,669
Change in fair value	4,913
Balance as of December 31, 2013	$ 18,582