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Distribution of Depreciation and Amortization by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Disclosure [Line Items]
Depreciation and amortization	$ 11,456	$ 10,802
Ireland
Segment Reporting Disclosure [Line Items]
Depreciation and amortization	4,989	4,495
Rest Of Europe
Segment Reporting Disclosure [Line Items]
Depreciation and amortization	1,734	1,980
U.S.
Segment Reporting Disclosure [Line Items]
Depreciation and amortization	3,718	3,402
Rest of World
Segment Reporting Disclosure [Line Items]
Depreciation and amortization	$ 1,015	$ 925

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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