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Distribution of Total Assets by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 1,293,122 | $ 1,202,108
Ireland |  |
Segment Reporting Information [Line Items] |  |
Assets | 508,504 | 476,159
Rest Of Europe |  |
Segment Reporting Information [Line Items] |  |
Assets | 237,348 | 236,305
U.S. |  |
Segment Reporting Information [Line Items] |  |
Assets | 496,922 | 437,756
Rest of World |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 50,348 | $ 51,888

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