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Distribution of Depreciation and Amortization by Geographical Area (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Disclosure [Line Items]        
Depreciation and amortization $ 11,520 $ 10,830 $ 22,976 $ 21,632
Ireland
        
Segment Reporting Disclosure [Line Items]        
Depreciation and amortization 4,836 4,506 9,825 9,001
Rest Of Europe
        
Segment Reporting Disclosure [Line Items]        
Depreciation and amortization 1,688 1,759 3,422 3,739
U.S.
        
Segment Reporting Disclosure [Line Items]        
Depreciation and amortization 3,987 3,535 7,705 6,937
Rest of World
        
Segment Reporting Disclosure [Line Items]        
Depreciation and amortization $ 1,009 $ 1,030 $ 2,024 $ 1,955