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Distribution of Net Revenue by Geographical Area (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Net Revenue $ 316,789 $ 252,333
Ireland
   
Segment Reporting Information [Line Items]    
Net Revenue 60,994 [1] 28,995 [1]
Rest Of Europe
   
Segment Reporting Information [Line Items]    
Net Revenue 85,036 86,044
U.S.
   
Segment Reporting Information [Line Items]    
Net Revenue 135,475 107,747
Rest of World
   
Segment Reporting Information [Line Items]    
Net Revenue $ 35,284 $ 29,547
[1] All sales shown for Ireland are export sales.