Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	$ 12,238
Reclassification to the income statement	(1,885)
Change in fair value	6,429
Balance as of September 30, 2013	16,782
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	13,669
Reclassification to the income statement	0
Change in fair value	2,655
Balance as of September 30, 2013	16,324
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	(1,431)
Reclassification to the income statement	(1,885)
Change in fair value	3,774
Balance as of September 30, 2013	$ 458