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Jurisdictions the Company Remains Subject to Tax Examinations (Detail)	12 Months Ended
	Dec. 31, 2018
United States | Earliest Tax Year | Federal
Income Taxes [Line Items]
Tax Years	2015
United States | Earliest Tax Year | State
Income Taxes [Line Items]
Tax Years	2012
United States | Latest Tax Year | Federal
Income Taxes [Line Items]
Tax Years	2018
United States | Latest Tax Year | State
Income Taxes [Line Items]
Tax Years	2018
Ireland | Earliest Tax Year
Income Taxes [Line Items]
Tax Years	2014
Ireland | Latest Tax Year
Income Taxes [Line Items]
Tax Years	2018
United Kingdom | Earliest Tax Year
Income Taxes [Line Items]
Tax Years	2017
United Kingdom | Latest Tax Year
Income Taxes [Line Items]
Tax Years	2018

X

- Definition

Income tax.

+ References

No definition available.

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X

- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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