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Jurisdictions in which the Company Remains Subject to Tax Examinations (Detail)	12 Months Ended
	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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X

- 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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