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Distribution of Property, Plant and Equipment, Net, by Geographical Area (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Property, plant and equipment, net $ 162,629 $ 168,373
Ireland
   
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 104,952 110,369
Rest Of Europe
   
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 14,973 16,115
U.S.
   
Segment Reporting Information [Line Items]    
Property, plant and equipment, net 33,661 32,400
Rest of World
   
Segment Reporting Information [Line Items]    
Property, plant and equipment, net $ 9,043 $ 9,489