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Components of Loss from Operations Before Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
United States	$ (13,583)	$ (2,075)	$ (8,115)
Loss from operations before taxes	(116,349)	(54,818)	(76,381)
Republic of Ireland and the United Kingdom
Income Taxes [Line Items]
Ireland and United Kingdom	$ (102,766)	$ (52,743)	$ (68,266)

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Income tax.

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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