Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013			$ 18,761
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(2,037)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1,459)	(4,688)	(152)	(6,327)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			870
Balance as of June 30, 2014	17,594		17,594
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2013			18,582
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax			(152)
Balance as of June 30, 2014	18,430		18,430
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			(2,037)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			1,022
Balance as of June 30, 2014	$ (836)		$ (836)