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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