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Jurisdictions Subject to Tax Examinations (Detail)	12 Months Ended
	Dec. 31, 2012
Minimum | United States
Income Taxes [Line Items]
Tax Years	2009
Minimum | Ireland
Income Taxes [Line Items]
Tax Years	2007
Minimum | United Kingdom
Income Taxes [Line Items]
Tax Years	2011
Maximum | United States
Income Taxes [Line Items]
Tax Years	2012
Maximum | Ireland
Income Taxes [Line Items]
Tax Years	2012
Maximum | United Kingdom
Income Taxes [Line Items]
Tax Years	2012

X

- Details

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X

- Definition

Tax year being audited in the income tax examination, in CCYY format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration