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Distribution of Total Assets by Geographical Area (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]    
Assets $ 1,231,220 $ 1,202,108
Ireland
   
Segment Reporting Information [Line Items]    
Assets 472,932 476,159
Rest Of Europe
   
Segment Reporting Information [Line Items]    
Assets 225,901 236,305
U.S.
   
Segment Reporting Information [Line Items]    
Assets 482,304 437,756
Rest of World
   
Segment Reporting Information [Line Items]    
Assets $ 50,083 $ 51,888