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Distribution of Interest Income by Geographical Area (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Disclosure [Line Items]      
Interest income $ 986 $ 1,151 $ 1,194
Ireland
      
Segment Reporting Disclosure [Line Items]      
Interest income 355 464 762
Rest Of Europe
      
Segment Reporting Disclosure [Line Items]      
Interest income 501 661 364
United States
      
Segment Reporting Disclosure [Line Items]      
Interest income   3 18
Other
      
Segment Reporting Disclosure [Line Items]      
Interest income $ 130 $ 23 $ 50