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Jurisdictions in which the Company Remains Subject to Tax Examinations (Detail) | 12 Months Ended
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Dec. 31, 2011
United States |
Income Taxes [Line Items] |
Tax Years | 2008-2011
Ireland |
Income Taxes [Line Items] |
Tax Years | 2006-2011
United Kingdom |
Income Taxes [Line Items] |
Tax Years | 2010-2011

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- Definition The tax year(s) being audited in connection with the income tax examination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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