Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	$ 12,238
Reclassification to the income statement	(358)
Change in fair value	(2,949)
Balance as of June 30, 2013	8,931
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	(6,327)
Balance as of June 30, 2013	7,342
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	(1,431)
Reclassification to the income statement	(358)
Change in fair value	3,378
Balance as of June 30, 2013	$ 1,589