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Distribution of Interest Income by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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