Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	$ 18,761
Reclassification to the income statement	(308)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,307	(1,639)
Change in fair value	2,181
Balance as of March 31, 2014	20,634
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	18,582
Reclassification to the income statement	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,307
Balance as of March 31, 2014	19,889
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013	179
Reclassification to the income statement	(308)
Change in fair value	874
Balance as of March 31, 2014	$ 745